How to Start a Swimwear Line in 2026: A Step-by-Step Guide

The swimwear market is booming, and now is an exciting time to jump in.

As of 2026, the global swimwear market is projected to hit $24.01 billion, with an annual growth rate of 6.3% from 2026 to 2035.

That growth isn't just happening at the industry level either. Swimwear sales on Fourthwall have grown roughly 47% year over year (Summer 2024 to Summer 2025), with August seeing sales more than doubling. 

So if you're interested in offering eco-friendly swimwear, personalized bikini designs, or cool board short prints in your next summer collection, the demand for innovative, high-quality swimwear is there.

In this guide, we'll walk you through the essential steps to launch your own swimwear collection online using real sales data from swimwear Creators on Fourthwall, so you know what actually sells, when it sells, and for how much.

Key Takeaways

• Learn how to research the swimwear market, identify profitable opportunities, and choose products that align with customer demand.
• Understand how to launch a swimwear line without upfront inventory by using print-on-demand services and an online platform like Fourthwall.
• Discover practical strategies for pricing, marketing, fulfillment, and customer service that can help turn first-time buyers into repeat customers.
• Find out how factors like inclusive sizing, product quality, and sustainability can help your swimwear brand stand out in a competitive market.

Why Sell Swimwear Online?

If you think swimwear is just a seasonal product for beach trips or hitting the pool, then you're greatly mistaken. 

In fact, many brands have blended swimwear into their year-round product lineup, marketing their items for vacations, resort wear, fitness activities, water sports, and warm-weather destinations worldwide. 

This has allowed many retail and fashion brands to reach customers well beyond the traditional summer season while offering products people purchase year-round. It's also one of the higher-value categories you can sell online. 

For instance, on Fourthwall, swimwear's average selling price over the last 30 days was $32.96 per piece, which is about 26% higher than t-shirts ($26.23), the platform's #1 category by sales. 

In other words, a swimwear catalog can generate meaningful revenue on lower unit volume, which can make a significant impact when you're building an audience from scratch.

7 Steps for Starting Your Own Swimwear Line 

Starting a swimwear line takes more than just coming up with trendy designs for bikinis and shorts. If you want your launch to be successful, you'll need careful planning and the right tools at your disposal. Luckily, we've got you covered. 

Below are six essential steps you should follow to create a swimwear brand that your customers will proudly flaunt, no matter the occasion.

Step 1: Research the Market

Before you start planning out your designs or choosing what material you want to work with, it's important to take enough time to research the market and see what's actually trending. 

Start by exploring the various types of swimwear, such as bikinis, one-piece swimsuits, rash guards, and active swimwear, and identify which categories align best with your brand's vision.

Here's one insight from Fourthwall's data that most new founders miss: don't assume swimwear means bikinis. 

Men's swim trunks are a single style, yet over the last 12 months they drove 48% of all swimwear revenue on the platform (457 units), and they sell for about 50% more per piece than women's styles ($39.31 average vs. $26.31 for bikinis and one-pieces). 

Trunks also have a distinct late-summer peak, with August as their single best month ($4,527). Men's swim remains an underserved whitespace, and a brand that takes it seriously can capture revenue that bikini-only lines leave on the table. 

That said, women's styles still move more units overall (744 vs. 457), so the strongest catalogs cover both.

Geographically, swimwear demand skews heavily toward Northern-Hemisphere English-speaking markets. 

Among Fourthwall swimwear orders where the buyer's country can be identified, roughly three-quarters are U.S., with the U.K., Australia, and Canada next, which matches the summer-led sales curve. (Treat this as directional; about half of orders don't have a country attributed.)

If you're looking to stay on top of what's in demand, use various resources to explore the latest trends and consumer preferences:

• Instagram: A great visual platform for spotting real-time fashion trends, where influencers, designers, and swimwear brands share their latest collections.
• Pinterest: Ideal for discovering visual inspiration and trend forecasts, with boards dedicated to swimwear trends for different seasons.
• Google Trends: Provides insight into what people are searching for, helping you track the popularity of different swimwear styles over time.
• Fashion Blogs: Websites like LSPACE, Bikini Village, and Pinksalt often cover emerging swimwear trends and seasonal must-haves.
• Trade Shows: Industry events like Miami Swim Week and Curve showcase the latest collections and trends, offering valuable insights into market trends.
• Swimwear Retailers: Look at popular swimwear brands such as Swimsuits For All, PacSun, and O'Neill to see which styles are performing well and gaining customer attention.

Step 2: Create a Business Plan for Your Swimwear Line

Now that you’ve looked over the data and understand what kind of products are trending, the next step is to incorporate your research into a solid business plan. 

Having a well-crafted business plan is the foundation for any successful swimwear brand. It helps you stay focused, meet market demands, and scale your swimwear brand effectively, so you don't go under right away. 

Here are some key steps to creating a solid business plan for your swimwear brand:

• Define Your Brand Vision and Goals: Start by outlining your long-term goals. Do you want to build a luxury swimwear line, cater to active swimwear enthusiasts, or offer custom swimsuits for a niche market? Understanding your brand's purpose will guide every decision you make, from design choices to marketing strategies.
• Identify Your Target Audience: Who are you designing for? Whether it's beachgoers, fitness enthusiasts, or eco-conscious consumers, knowing your target audience is crucial. Take time to define their preferences, lifestyle, and what kind of swimwear they are looking for.
• Set Up Your Legal and Tax Structure: Decide how your business will be structured before the orders start coming in. Many small brand owners form an LLC (limited liability company), which keeps your personal assets legally separate from the business and adds credibility with suppliers and partners. Sales tax is another early headache, since ecommerce sellers can owe tax in many states and countries. This is one more area where Fourthwall lightens the load: it acts as the Merchant of Record on every sale, meaning it handles collecting and remitting sales tax for you, so you're not tracking tax obligations across dozens of jurisdictions yourself.
• Develop Pricing and Sales Strategies: Set clear pricing strategies based on your target audience and market positioning. To ground your numbers in reality, here's what a full print-on-demand swimwear range looks like at Fourthwall's current suggested retail prices:

In other words, a complete catalog spans roughly $14 for a single bikini top to $36 for men's trunks, with full sets and one-pieces landing in the high $20s. 

For reference, the realized average selling price across all swimwear on the platform over the past year was $31.10, so there's room to price above suggested retail, especially for distinctive designs. 

With print-on-demand, your profit is spread between the retail price you set and the base production cost, so it's best to keep your margin in mind from the start.

Step 3: Choose Your Business Model

Every swimwear brand starts with the same fork in the road: make a big batch of swimsuits and hope they sell, or sell each one before it's ever made. 

Some entrepreneurs choose to order inventory upfront and manage their own stock, while others use print-on-demand, where products are only made after a customer places an order. 

It's the same decision every Creator faces when starting their own clothing brand, and swimwear is no exception.

Here's a better look at both options to choose from:

Customizing Your Swimwear: The Cut-and-Sew Advantage

If you want to build your swimwear collection from scratch, cut-and-sew is the option that gives you total creative control. 

With this model, you (or a designer you hire) sketch original designs and translate them into tech packs (the detailed blueprints a factory uses to construct each garment), covering everything from fabric specs and stitch types to hardware and label placement. 

A pattern maker then drafts and grades the patterns across your full size range, and you partner with a manufacturer to produce samples, refine the fit over several revision rounds, and ultimately commit to a bulk production run of finished pieces. 

The result is a garment that's entirely yours and no other brand can replicate. 

However, this process demands real capital, months of lead time, and a willingness to hold inventory in one of the most seasonal categories in fashion. 

Pros:

• Total control over every detail
• Proprietary fits competitors can't copy
• Lower per-unit costs at scale
• Ready for wholesale and retail

Cons:

• High upfront investment: $20,000-$50,000 typical
• Minimum orders require 100-300+ units
• Serious inventory risk in seasonal category
• Long lead times: four to nine months

How Print-on-Demand Makes Swimwear Launches Easier

Print-on-demand flips the traditional manufacturing model on its head. Instead of producing inventory and hoping it sells, nothing gets made until a customer has already paid for it. 

You upload your artwork to professionally pre-engineered swimwear styles; the platform handles patterns, fabric sourcing, size grading, and construction, and when an order comes in, that single piece is printed, cut, sewn, and shipped directly to your customer. 

On a platform like Fourthwall, this happens through full-sublimation printing on recycled fabric, meaning your design is dyed into the entire garment edge to edge rather than pressed onto a panel. 

You never touch inventory, finance a production run, or pack a box; you simply pay a base production cost per unit sold, and your profit is the spread between that base cost and the retail price you set. 

The trade-off is that you're customizing a catalog of proven silhouettes rather than inventing your own, which is exactly why it's the smartest starting point for testing whether your swimwear brand has a market before committing real capital.

Pros:

• Near-zero startup cost to launch
• No inventory risk or minimums
• Live products within a few days
• Test designs without financial commitment

Cons:

• Thinner margins than bulk manufacturing
• Limited to the platform's silhouettes
• Less control over construction details

Step 4: Source Your Swimwear Materials and Manufacturers

If you go the cut-and-sew route, sourcing the fabric you choose and the factory that sews it will make or break your line. 

Everything starts with a tech pack, which is essentially a detailed instruction guide for your manufacturer. 

It outlines exactly how your swimwear should be made, including design sketches, sizing measurements, fabric choices, colors, and construction details like seams and stitching.

With a tech pack in hand, you'll pick a manufacturer: overseas factories in countries like China offer lower per-unit costs but higher minimums and longer lead times, while domestic makers cost more per piece but deliver faster turnaround, easier quality checks, and a boutique story. 

Before committing to a bulk run, always test samples and check things for stretch recovery, wet opacity, colorfastness. Most importantly, you should plan around the seasonality data, since inventory arriving in September sits through a five-month sales trough. 

But it all starts with the material itself. Swimwear fabric has to withstand chlorine, salt, sunscreen, and sun exposure, and the right choice depends on what your brand is optimizing for.

Best Fabrics for Swimwear

• Nylon/Spandex Blends: The classic swimwear combination, prized for its silky feel, vivid color, and four-way stretch that hugs the body and recovers its shape. A typical blend is around 80% nylon to 20% spandex (also called elastane or Lycra).
• Polyester: The workhorse of modern swimwear. It's more resistant to chlorine, UV, and fading than nylon, and the only fiber that works with sublimation printing, which is why all-over print swimwear (including Fourthwall's) is polyester-based.
• PBT (Polybutylene Terephthalate): A textured polyester variant used in competitive and athletic swim because it's naturally chlorine-proof, quick-drying, and holds its shape lap after lap. Ideal if your line targets serious swimmers.
• UPF-Rated Fabrics: Tightly woven materials carrying an Ultraviolet Protection Factor rating (UPF 50+ blocks about 98% of UV rays), essential for rash guards, kids' swim, and any sun-safety-focused line.
• ECONYL (Regenerated Nylon): Premium recycled nylon made from reclaimed fishing nets and other ocean and landfill waste, with the same stretch and feel as virgin nylon. A favorite of sustainable luxury swim brands and great for brand storytelling.
• REPREVE (Recycled Polyester): Recycled polyester fiber spun from post-consumer plastic bottles, offering polyester's durability and chlorine resistance with a smaller environmental footprint.

Whatever fabric you choose, look for OEKO-TEX certification, an independent standard verifying textiles are free from harmful chemicals. It's an easy trust signal to feature on product pages, and it matters for a garment worn directly against skin.

Step 5: Setting Up Your Swimwear Store

Once you've mapped out your business strategy and are fully confident in the kind of swimwear products you want to sell, it's time to set up your online store. 

No matter which platform you choose to sell your swimwear collection, your shop should include essential features: easy navigation, secure payment options, and a smooth checkout process that doesn't stress customers. 

But most importantly, you should have high-quality images that clearly showcase your swimwear, highlighting the fit, colors, patterns, and details that help shoppers feel confident enough to make a purchase.

An ecommerce platform like Fourthwall is a great choice for Creators and brands looking to sell custom swimwear products online. 

It offers a streamlined process for uploading your designs, managing products, and organizing your store's layout, with no coding skills required.

Additionally, Fourthwall's print-on-demand service means you don't have to worry about holding inventory or paying upfront for production. 

Everything is made to order and includes cut-and-sew bikinis, one-piece suits, padded tops, and men's swim trunks, all made from recycled fabric with sublimation printing. 

As your orders come in, Fourthwall handles everything from printing to fulfillment and shipping directly to your customers, letting you focus more on designing than logistics.

Step 6: Market Your Swimwear Line

If you want your swimwear line to gain traction, you need to start marketing before customers are ready to buy. 

Since nearly half of all swimwear sales happen between June and August, the smartest brands begin building awareness in May and early June through social media, email campaigns, and influencer partnerships. 

By the time peak season arrives, you'll already have an audience eager to shop your collection.

Social media platforms like Instagram, TikTok, Pinterest, and YouTube are ideal for showcasing custom swimsuits and bikinis through visually appealing posts that drive traffic to your product page.

Here are a few examples of swimwear products and the best ways to market them online:

• Bikinis: Showcase your custom bikini designs with dynamic photos and videos on Instagram and TikTok, highlighting how they fit and flatter different body types. Use Instagram Stories for behind-the-scenes content, or try short TikTok videos showing the bikinis in action on the beach or poolside.
• One-Piece Swimsuits: Position your one-piece swimsuits as both stylish and functional for a variety of activities, like swimming or beach lounging. Collaborate with influencers who embody the active yet fashionable lifestyle, sharing lifestyle content that shows how versatile the one-piece is.
• Swim Trunks: This is where the money is hiding. Trunks drive nearly half of swimwear revenue on Fourthwall and peak in August, later than the overall category. Market them on Instagram and YouTube by focusing on versatility and comfort, from casual beach days to active water sports. Highlight color variations and unique patterns, partner with lifestyle influencers who enjoy water-based activities, and keep promoting into late summer when trunk demand is at its highest.
• Rash Guards: For performance-focused swimwear like rash guards, target active audiences on platforms like Pinterest and YouTube. Create informative content such as YouTube tutorials or Pinterest pins explaining the benefits of wearing a rash guard for surfing, water sports, or long beach days.
• Sustainable Swimwear: If your swimwear line is eco-friendly, use social media to emphasize sustainability. Share posts about the materials used (e.g., recycled fabrics) and how your swimwear reduces environmental impact. Engage with eco-conscious influencers to help spread the message.

If you already have a strong customer base or online following, invest in email marketing tools like Klaviyo, Mailchimp, or Kit for campaigns and product newsletters that keep your customers up to date on new releases and upcoming promotions.

Step 7: Managing Your Swimwear Fulfillment, Shipping, and Inventory

Selling swimwear doesn't stop once you've created your designs. You also need a reliable system that can handle orders and get products to customers on time. 

This is especially important in a seasonal category like swimwear, where demand can change dramatically throughout the year. 

On Fourthwall, swimwear sales can be about 9x higher in the summer than in the fall, making it important to prepare for both busy and slow periods. 

Fortunately, the platform simplifies operations by providing a single dashboard to track orders, manage products, and monitor your store's performance. 

And because every swimsuit is made to order, there's no need to purchase inventory upfront or worry about leftover stock at the end of the season. 

Fourthwall also handles fulfillment and shipping, ensuring orders are produced, packed, and delivered directly to your customers. 

To help maintain your customers' trust, all products are backed by quality guarantees so every order meets the standards your customers expect.

Tips and Recommendations to Start a Swimwear Line

The steps above will get your swimwear line into the water, but staying afloat is a different skill entirely. 

The brands that survive past their first summer aren't necessarily the ones with the best prints; they're the ones that sweat the unglamorous details: sizing runs, fabric quality, customer trust. 

Now that your launch roadmap is set, here are a few tips to follow that will help make the difference between a shop that makes a splash in July and a brand that's still swimming strong next season.

Identify Your Unique Selling Proposition (USP)

In a market where thousands of shops sell tropical-print bikinis, "cute designs" is not a unique selling proposition. 

A real USP answers a question a specific customer is already asking: Where can I find swimwear that fits my body, my values, or my lifestyle? 

That might mean eco-friendly fabrics, genuinely inclusive sizing, designs built around a fandom or community you already serve, or a focus on an underserved segment like men's swim (which, as the data shows, quietly drives nearly half of swimwear revenue). 

To find yours, study three to five competitors and write down what they all have in common, then build your brand around what's missing from that list.

Offer Inclusive Sizing 

Offering a wide range of sizes isn't just about being inclusive. It can also help you reach more customers and generate more sales. 

To help you get a better understanding, here is recent data we gathered from Fourthwall Creator stores in the last 12 months.

• M and L sizes accounted for about 46% of all swimwear units sold.
• Sizes 2XL-6XL made up nearly 20% of all swimwear sales.
• 2XL represented 7.7% of units sold.
• 3XL represented 6.3% of units sold.
• Sales remained consistent across 4XL, 5XL, and 6XL.

The takeaway is simple: brands that stop at XL could be missing out on nearly 18% of potential customers. 

To better serve these shoppers, offer detailed size charts, use photos featuring different body types, and make your inclusive sizing options easy to find throughout your store. 

When customers feel represented and confident in the fit, they're much more likely to make a purchase and come back again.

Quality Control is Key

Swimwear experiences much more wear and tear than most clothing. Between chlorine, saltwater, sunscreen, sunlight, and constant stretching, swimsuits need to hold up in conditions that can quickly expose quality issues.

That's why it's important to test your products before you start selling them. Order samples and wear them yourself whenever possible. 

Pay close attention to key areas such as seams, straps, waistbands, and leg openings, as these tend to see the most wear and tear. 

If you're using print-on-demand, always order samples with your actual designs because colors and prints can look different in person than they do on a screen. 

Don't treat quality testing as a one-time task before launch. Regularly checking your products can help prevent customer complaints, bad reviews, and unnecessary returns.

Prioritize the Customer Experience

Many people are hesitant to buy swimwear online because they're unsure how it will fit. 

Help build your customer's confidence by providing clear size charts, detailed measurements, and fit notes that explain how each swimsuit fits. 

Using photos of different body types can also make it easier for shoppers to find a style that feels right for them. And make sure your return and exchange policy is easy to find so customers know they have options if something doesn't fit as expected. 

It's also important to answer questions quickly and keep customers updated on their orders. When shoppers have a positive experience, they're much more likely to trust your brand and come back for future purchases.

Highlight Sustainability

Many shoppers care about sustainability, but they want brands to be transparent about their environmental claims. 

Instead of using vague terms like "eco-friendly," explain exactly what materials your products are made from and where those materials come from. 

If you sell through Fourthwall, every swimwear product is made from recycled fabric, and because items are produced only after they're ordered, there's no excess inventory going to waste. 

By being clear about what your products are made of, you can build trust with customers and give them another reason to feel confident about supporting your brand.

Start Your Swimwear Line with Fourthwall

Ready to launch your own swimwear brand?

Fourthwall makes it easy to design and sell custom swimwear without the burden of large upfront investments or managing inventory.

Using Fourthwall's print-on-demand services, you can focus on creating unique designs while they handle manufacturing, shipping, and customer service.

From all-over-print one-piece swimsuits and recycled padded bikini tops to swim trunks and high-waisted bottoms, Fourthwall offers a diverse range of swimwear to bring your vision to life.

Whether you're designing custom youth swimsuits, recycled string bikinis, or other trendy styles, you can get started with no minimum order requirements. With Fourthwall, launching your swimwear business has never been easier.

Sign up today and take your merchandise line to new heights.