The swimwear business keeps growing. Analysts raise the global market at around $22 billion to $28 billion as of 2025, rising 5% a year through 2030, and plenty of that money now goes to small brands selling directly online.

Here’s what nobody tells new founders. A swimsuit is one of the hardest garments to build. The fabric stretches four ways, the elastic sits on bare skin, the seams face chlorine, salt, and sunscreen, and the fit shows every small error. A T-shirt forgives a sloppy pattern. A bikini does not.

New brands lose money the same way every time. They skip the tech pack, buy fabric on price, approve a sample they never wear-tested, then find out after bulk that the lining goes see-through in water.

Cord Apparel makes swimwear for startup labels. This guide covers what happens between your first sketch and a packed carton.

What Is Swimwear Manufacturing?

Swimwear manufacturing is the full build of a swim garment: sketch, fabric sourcing, pattern engineering, sampling, fit correction, bulk sewing, and inspection. It sits closer to technical sportswear than to fashion.

Shirts hang off the body. Swimwear works against it. The pattern gets cut smaller than the measurement it covers because the fabric stretches to fit. Miss that negative ease by half an inch and the bottom is ruined.

Water makes it harder. Chlorine eats spandex, salt dries fabric out, sunscreen stains pale shades, and sun fades dyed.

Types of Swimwear Brands Can Manufacture

Pick your first category carefully. Each style carries its own pattern work, trims, and sampling cost.

Bikinis

Sets or separates, chosen on fit and print. Cup structure and strap tension decides quality. Nylon-spandex, 190 to 220 gsm.

One-Piece Swimsuits

More fabric and pattern work. Torso length must grade right or the shoulders pull. Front lining needed.

High-Waisted Swimwear

Retro bottoms for extra coverage. Use wide elastic or a self-fabric casing, not a thin band that rolls.

Tankinis

A tank with separate bottoms, popular with older buyers. Grade length so the top clears the bottom.

Rash Guards

Sun and board protection for surfers and kids. Flatlock seams, fabric rated UPF 50+.

Swim Shorts

Men’s trunks with a mesh liner and drawcord waist. Quick-dry polyester. Watch the eyelet finish.

Board Shorts

Longer and stiffer, with a fly closure and bonded side seams. Hardware raises development costs.

Surf Wear

Rash guards, neoprene tops, surf leggings. Seam placement matters since anything over the ribs rubs raw.

Competitive Swimwear

Racing suits clubs and teams. Chlorine resistance is non-negotiable, so PBT beats nylon-spandex.

Maternity Swimwear

Side ruching, extra bust support, generous front panels. Recovery matters more than print.

Kids’ Swimwear

No loose cords or detachable parts. Sun-protective fabric sells to parents. Grading needs care.

Plus-Size Swimwear

Not a scaled-up straight size. Own block, redrawn proportions, stronger elastic, reinforced straps.

Best Fabrics for Swimwear

Swim fabric is a knit built from a base fiber plus elastane, usually 15% to 22%. Fashion swim runs 180 to 220 gsm, and anything under 170 gsm goes sheer when wet.

Nylon-spandex is the fashion default. Soft and dyes beautifully, but chlorine eats the elastane, and it dries slowly.

Polyester-spandex holds color longer, dries faster, and manages pool water. The hand feels crisper.

Recycled nylon performs like virgin nylon. ECONYL, from reclaimed fishing nets, runs 20% to 40% dearer.

Recycled polyester comes from used bottles. Cheaper eco route, dries fast, flatter hand.

Chlorine-resistant blends pair polyester with PBT, which holds shape without much elastane. Teams buy these.

Sublimation printing bonds dye into polyester fibers, so prints never crack. It doesn’t work the same on nylon, which is why printed collections sit on a polyester base.

What Goes into a Well-Made Swimsuit

Shoppers can’t name these details. They just know one suit feels cheap and another feels worth $90.

Lining: Power mesh, 70 to 100 gsm. Front lining is the minimum, and pale solids need full lining.

Elastic: Rubber elastic holds its grip in chlorine and salt. Covered elastic goes slack after a season. Widths run 6mm to 8mm.

Cups and padding: Removable pads sit in a sewn pocket. Sewn-in foam gives more shape. Molded cups add tooling cost.

Adjustable straps: Nickel-free sliders and rings. Evaluate them in salt water because cheap hardware corrodes and stains fabric.

Closures: Hooks, clasps, ties, and zippers each add a failure point that needs reinforcement.

Seams: Flatlock lies flat on skin for rash guards. Overlock with a zigzag topstitch suits bikinis. Bonded seams remove bulk.

Reinforcement: Bar tacks at strap joins, crotch seams, and tie anchors.

Step-by-Step Swimwear Manufacturing Process

The first collection lasts 10 to 16 weeks. Repeating orders move faster because the patterns exist.

1. Product concept: Decide what you’re selling and to whom, then work back from retail price to a workable unit cost.
2. Market research: Buy a competitor’s product and take it apart. A seam ripper teaches more than a week of reading.
3. Tech pack development: Flats, measurements with tolerances, fabric and trim specs, stitch types, labels. Weak tech packs cause wrong samples.
4. Fabric and trim sourcing: Order lab dips and swatches. Check weight, stretch, opacity when wet, and minimum yardage.
5. Pattern making: Each piece drafted with the right negative ease. Change the fabric, and you redraft.
6. Sample development: The first prototype arrives, usually imperfect.
7. Fit testing: Fit on a live model in your base size, then in water. Dry fit lies.
8. Revisions: Mark corrections, update the tech pack, resample. Two or three rounds are normal.
9. Pre-production approval: Sign off on a sealed sample in final fabric, trims, and color.
10. Grading and bulk manufacturing: Patterns graded across sizes, fabric cut in layers, lines run the order.
11. Quality inspection: Inline checks plus a final AQL inspection.
12. Packaging and shipping: Hygiene liners, polybags, hangtags, cartons, then freight.

Common Challenges Startups Face

Every problem below costs money twice: once when it happens, once when you remake the order.

How to Choose the Right Swimwear Manufacturer

Judge a supplier on swim work, not their website gallery. Watch their speed too: nine days for a fabric question means nine days during production.

• Two full seasons of swimming production or more?
• Physical samples of their own swim?
• Do they source swim-grade fabric directly?
• Composition, weight, and stretch percentage in writing?
• Sampling rounds included before extra charges.
• MOQ per style and per color way?
• Private labels with your labels and packaging?
• Replies within 24 to 48 hours?
• Certifications such as OEKO-TEX Standard 100 or GRS?
• Capacity that grows with reorders?
• Inspection standard, and who pays if a batch fails?
• Timeline in writing with named milestones?

Before committing, buy one sample from their existing range. Cord Apparel’s swimwear manufacturing starts at 50 pieces.

Quality Control in Swimwear Manufacturing

Swimming gets inspected more strictly than most apparel because the failures are visible. A serious program covers:

• Fabric inspection for weight, shade, holes, and needle lines before cutting.
• Stretch and recovery testing, where good fabric returns to within a couple of percent.
• Colorfastness against water, chlorine, perspiration, sunlight, and rubbing.
• Chlorine resistance, with swatches soaked and checked for elastane breakdown.
• Seam strength, pulled until failure, plus checks for skipped stitches.
• Measurement verification at every point of measure, across every size.
• Needle detection, which matters most for kids’ swim.
• Final AQL inspection for workmanship, trims, labels, and shading.
• Packaging inspection for liners, hangtags, and correct sizing.

Private Label vs. Custom Swimwear Manufacturing

These four terms get used loosely, and the confusion costs founder’s money.

Private label puts your brand on a style the factory already makes. Fast and cheap, but your competitor can buy the same suit.

OEM means you supply the design and specs, and the factory builds exactly that.

ODM means you modify the factory’s existing designs: print, color, straps, neckline.

Fully custom starts with a blank page, with new patterns and your own fit block.

Most startups begin with ODM or private label, then move to OEM once they know what sells.

Sustainable Swimwear Manufacturing

Shoppers ask about this now, and vague claims invite backlash. Pick what you can back with documents.

Recycled fabrics: ECONYL nylon and rPET come with Global Recycled Standard paperwork from a certified mill, and that certificate is what lets you make the claim.

Dyes: OEKO-TEX Standard 100 confirms no harmful substances above the limits. Dope dyeing colors the fiber before spinning and uses far less water.

Digital printing: Skips screen prep and heavy water use and makes small runs affordable.

Packaging: Recycled or compostable polybags, paper hangtags, no plastic tape.

Ethical production: Audited facilities, fair wages, certifications like WRAP or SA8000.

Recycled fabric means little if the suit dies in one season. Cord Apparel’s eco-conscious production starts with materials that last.

Cost Factors in Swimwear Manufacturing

Two bikinis that look identical can differ by 60% in cost. The levers:

• Fabric quality and weight: The biggest line item, on both price per yard and yardage used.
• Colorways: Each color is a separate dye lot with its own minimum yardage.
• Prints: Sublimation adds a per-yard charge, and placement prints add fabric waste.
• Hardware: Rings, sliders, and zippers each add material and a sewing step.
• Padding and lining: Molded cups need tooling, and full lining doubles lining yardage.
• Order quantity: The jump from 50 to 300 units is usually the steepest saving.
• Sampling rounds: Every extra round costs money and calendar time.
• Packaging and shipping: Printed bags carry minimums. Air freight is fast and dear; sea is slow and cheap.

Ask for a cost breakdown, not a single number.

Swimwear Design Trends Startups Should Watch

Trends matter less than fit, but they shape what a buyer notices in a feed.

• Minimalist shapes: Clean solids, simple straps, no hardware. They photograph well and cost less.
• Textured fabrics: Ribbed and crinkle knits hide body lines and lift plain colors.
• Recycled collections: More shoppers check the fabric label now.
• Inclusive sizing: Brands running XS to 4X take share from those stopping at XL.
• UV-protective fabric: UPF 50+ rash guards sell year-round, and parents don’t flinch at the price.
• Compression swim: Shaping panels built into fashion shapes, not hidden under them.
• Matching resort pieces: A sarong or shirt lifts order value with no new fabric.
• Bold prints: One print across several silhouettes beats many prints in one shape.

How Cord Apparel Helps Startup Swimwear Brands

Cord Apparel works with new labels from its Missouri City, Texas base.

Sketches but no specs? The tech pack service turns your idea into a production document with flats, measurements, stitch callouts, and trim codes.

Unsure which fabric is? The sourcing team matches fabric to your price point and confirms weight and opacity before cutting.

First sample never fits. Pattern making and sampling run in-house, and cut-and-sew production follows the approved sample exactly.

Minimums are too high. MOQs start at 50 pieces.

Want your own brand? Private label covers woven labels, heat transfer labels, hangtags, and custom packaging. Sublimation printing handles all-over prints.

Can’t inspect the factory? Quality control runs at multiple stages, with USA-based and global production options.

Need more than swim? The same team makes activewear, so one supplier covers the range.

Conclusion

Good swimwear comes down to four things: fabric that holds up wet, a pattern cut with the right negative ease, trims that survive chlorine and salt, and checks that catch problems before shipping. Design sells the first order. Those four sell the second.

Your manufacturer decides how many you get right. One who knows swim flags a transparency problem at the swatch stage. One who doesn’t flag it after you’ve paid for 300 units.

Planning a collection? Talk to Cord Apparel.

Frequently Asked Questions

How does swimwear manufacturing work?

Concept, tech pack, fabric sourcing, pattern making, sampling, fit testing, approval, bulk sewing, inspection, packing. The first collection takes 10 to 16 weeks.

What fabrics are best for swimwear?

Nylon-spandex for soft fashion swim, polyester-spandex for color and fast drying, polyester-PBT for pools, recycled nylon or rPET for eco claims.

How much does it cost to manufacture swimwear?

It depends on fabric weight, colorways, printing, hardware, lining, and order size. Ask for a breakdown by fabric, trims, labor, and packaging.

What is the minimum order quantity for custom swimwear?

It varies. Cord Apparel starts at 50 pieces. Many factories won’t quote below 300 to 500 per style.

How long does swimwear production take?

Sampling takes three to six weeks across two or three rounds. Bulk runs take four to eight weeks after approval.

What is the difference between private labels and custom swimwear?

Private labels your brand in an existing factory style. Custom builds your own design from your patterns and specs.

What should startups include in a swimwear tech pack?

Flats, measurements with tolerances, fabric composition and weight, elastic type, lining, stitch types, trims, label placement, and care notes.

How many samples are needed before bulk production?

Two or three rounds, ending with a sealed pre-production sample in final fabric and color.

What quality tests are important for swimwear?

Stretch and recovery, colorfastness, seam strength, opacity when wet, measurement checks, needle detection, and a final AQL inspection.

Can swimwear be manufactured using sustainable materials?

Yes. Recycled nylon and recycled polyester both work well. Ask for Global Recycled Standard paperwork so your claims hold up.

Does Cord Apparel manufacture custom and private label swimwear?

Yes, both, with your own labels, tags, and packaging, and USA-based or global production options.

Can Cord Apparel help with fabric sourcing and product development?

Yes. Fabric sourcing, swatches, tech packs, pattern making, and sampling, so brands working from sketches can still reach production.

How do I choose the right swimwear manufacturer?

Check their swim experience, ask for samples of their own work, confirm fabric sourcing and MOQ, and test response time.

What are the biggest mistakes new swimwear brands make?

Skipping the tech pack, buying fabric on price, approving samples without a wet fit test, and starting production too late.

How can I request a quote for custom swimwear manufacturing?

Send sketches, references, or a tech pack through the Cord Apparel contact page with your quantity and timeline.