Custom Swimwear Manufacturer: Fabrics, Fit and MOQ Guide

Custom swimwear manufacturer programs usually use nylon or polyester blended with 15–22% elastane at about 160–220 GSM, a lighter lining, elastic edges and optional removable cups. Brand MOQs often run 100–300 pcs per style or 50–100 pcs per colour, with 10–20 days per sample and 30–50 days for bulk.

Good to know: Swimwear are outside Weavnora's production range. We focus on heavyweight and garment-washed T-shirts, hoodies, sweatshirts and sets; browse the heavyweight T-shirts page or get a quote for those products.

Swimwear is unforgiving. It is worn tight, wet and in public, so a fit problem that would pass on a T-shirt becomes a return or a bad review. The good news is that most problems can be found before bulk with a structured set of tests. This guide is organised as a checklist: what to specify, what to test and what to approve at each step with a swimwear factory.

What is a custom swimwear manufacturer?

A custom swimwear manufacturer is a factory that cuts and sews bikinis, one-piece swimsuits, rash vests and swim shorts from stretch fabrics to a brand's own patterns, prints, linings and trims. Most programs use nylon or polyester with about 15–22% elastane at around 160–220 GSM, start at about 100–300 pcs per style, and ship bulk in roughly 30–50 days after the final sample.

Checklist 1: Choose the swim fabric

Start with the shell fabric, because it decides feel, durability and price. Nylon-elastane is soft, has a slight sheen and is the default for fashion swimwear. Polyester-elastane feels a little firmer, resists chlorine and holds printed colour better, so it suits training and family pool wear. Ribbed, textured and metallic fabrics are popular for fashion drops but need extra care in sewing and printing. Ask for fabric data sheets that list composition, weight, stretch in both directions and UV or chlorine claims. If your range overlaps with sun-protection clothing, our UPF clothing manufacturer guide explains how UPF ratings are tested.

Checklist 2: Decide lining, cups and support

Most swimwear is fully or partly lined. A lighter lining gives opacity when wet and a smoother look. Decide whether tops use removable foam cups, sewn-in moulded cups, underwire or only a double layer of fabric. Removable cups are popular but can shift, so ask about pocket design. For larger sizes, plan structured support from the start rather than scaling a small-size pattern. The same support principles appear in our custom sports bra manufacturer guide, which is useful if your swim range includes active tops.

Checklist 3: Specify elastic, trims and hardware

Swim elastic must resist chlorine and salt. Rubber or treated elastic is common in edges, set with a zigzag or coverstitch. Metal rings, sliders and hooks should be coated or made of corrosion-resistant materials, and ideally tested in salt water. Include all trims in the tech pack with sizes and finishes, and ask for a trim card before bulk.

Nylon vs polyester swimwear: which option fits?

Most swim ranges choose between nylon and polyester bases, sometimes using both. The table compares them on common selection criteria.

The trade-offs are softness against durability. Fashion and resort brands usually lead with nylon, while performance and family brands prefer polyester. A mixed range is fine as long as each style has its own fabric approval.

How should you approach swimwear prints?

Prints are often the main reason customers buy a swimsuit. Digital printing on white fabric gives detailed artwork with smaller minimums, while sublimation on polyester gives strong colours that resist fading. Plan a strike-off for each print and colourway, and check print scale on the smallest and largest size. Our guide to sublimation printing for clothing brands covers artwork setup and colour approval in more detail.

How do you test swimwear before bulk?

Run a short test plan on the pre-production sample:

1. Wet opacity: check the suit is not see-through when wet, especially in light colours.
2. Stretch and recovery: the suit should return to size after repeated stretching.
3. Chlorine and salt exposure: soak samples and compare colour and elastic after drying.
4. Seam strength: pull seams at stress points such as straps and leg openings.
5. Fit in water: test on real fit models in sizes across the range.

What should you know about sizing?

Swim sizing is tighter than ready-to-wear. Many brands sell tops and bottoms separately so customers can mix sizes. Decide on cup-based or dress-based sizing and keep grading rules consistent. A clear size chart reduces returns; see our guide on how to create a size chart for a clothing brand.

How is a swimwear program priced?

Swimwear cost is driven by fabric, the number of pattern pieces, lining, cups, elastic, hardware, printing and order quantity. A plain lined bikini in a stock solid colour is the most economical style. Each added feature raises sewing time: underwire, adjustable straps, cut-outs, ruching, ties and decorative hardware. Custom prints add strike-off and setup cost, which is easier to absorb on larger runs. To compare factories fairly, send the same tech pack to each and ask for a line-by-line quote that lists fabric composition and weight, lining, cups, elastic type, hardware, print method and packaging. That makes it clear whether a lower price comes from a lighter fabric, fewer trims or simply a different interpretation of the design.

What does a swimwear production timeline look like?

Swimwear is seasonal, so the calendar matters as much as the product. A typical timeline is:

1. Tech pack, fabric and trim selection: about 1–2 weeks.
2. Print development and strike-offs: about 7–14 days per print.
3. First sample: about 10–20 days once fabric is available.
4. Fit and wet testing, then a second sample: another 2–3 weeks.
5. Bulk fabric, printing and production: about 30–50 days from approval.

Work backwards from your launch date. For a northern-hemisphere summer, many brands finalise samples in autumn and receive stock in early spring, leaving time for photography and wholesale orders.

Common mistakes in swimwear programs

• Approving a dry sample without a wet test.
• Using standard elastic that degrades in chlorine.
• Choosing a print scale that only works on one size.
• Skipping a salt-water test on metal hardware.
• Planning a summer launch without allowing for print strike-offs.

Custom swimwear manufacturer: typical specs and key numbers

These are typical industry estimate ranges, not quotes; confirm actual figures with your supplier for your fabric, quantity and destination.

Key takeaways

• Choose nylon for softness and polyester for chlorine and print durability.
• Decide lining, cups and support before the first sample.
• Specify chlorine-resistant elastic and corrosion-resistant hardware.
• Test opacity, recovery and fit in the water before bulk.
• Book swim production early so the season does not slip.

What Weavnora can make for this collection

If your collection also includes heavyweight or garment-washed T-shirts, hoodies or sweatshirts, Weavnora can quote and sample them. Start from the heavyweight T-shirts page or share your brief; for swimwear, work with a dedicated specialist. More sourcing guidance is in our start a clothing brand production hub.