How to Care for Swimwear So It Keeps Its Shape
By Thunderpants - New Zealand made | Published: 2026-09-10
Category: Tips & Care
Learn how to care for swimwear so it keeps its shape, from rinsing off chlorine to drying flat. Simple washing swimwear tips that make a swimsuit last longer.
Quick answer
Rinse your swimwear in cool water immediately after every swim, wash it gently by hand or on a delicate cycle with mild detergent, and dry it flat in the shade. Never wring, tumble dry, or leave it bundled in a wet towel. These habits remove chlorine and salt before they break down stretch fibres, which is the fastest way to make a swimsuit last longer.
Swimwear takes a beating that everyday clothing never sees: chlorine, salt, sunscreen, hot tubs, and repeated stretching. The fabric can handle it, but only if you remove those residues before they set in. Most swimsuits don't wear out from swimming — they wear out from what happens after.
This guide walks through a simple care routine you can follow in a few minutes after each swim. It works for any swimsuit, including a flared swim dress with more coverage. The steps are ordered so you can build them into your routine without thinking about it.
Why swimwear loses its shape
Swim fabric relies on elastane or similar stretch fibres to snap back after stretching. Chlorine, salt, sweat, and sunscreen slowly degrade those fibres. Heat speeds up the damage, and mechanical agitation — a spin cycle or a wringer — stretches them past recovery. Once elastane is compromised, the suit goes baggy at the knees, seat, or straps and no amount of washing brings it back.
The good news is that the damage is cumulative and largely preventable. Rinsing immediately after a swim removes most of the chlorine before it has time to react. Drying flat keeps the garment from stretching under its own weight. Small habits, repeated, are what keep a suit fitting the way it did on day one.
- Chlorine and salt are the main enemies of stretch fibres.
- Heat and agitation do more harm than the swim itself.
- Rinse first, wash second, dry flat always.
What you need
You don't need special products. A basin or sink, cool water, and a mild liquid detergent are enough. Avoid anything labelled as a bleach, fabric softener, or enzyme-heavy stain remover — those can attack stretch fibres or leave a residue that traps oils. If you're washing in a machine, use a mesh laundry bag and choose the most delicate cycle your machine offers.
For drying, a flat rack or a clean towel works. Direct sun is best avoided because UV can fade colours over time, even on suits that are chlorine-resistant. A shady spot with good airflow dries a suit quickly without cooking it.
- Cool water and mild detergent are the basics.
- Skip bleach, softeners, and harsh stain removers.
- A mesh bag protects swimwear in a machine.
Your 5-step swimwear care routine
- Step 1: Rinse immediately after every swim: As soon as you leave the pool or beach, rinse your swimsuit in cool water. If you can't get to a tap, rinse it in the shower or at least soak it in a basin. This removes chlorine, salt, and sunscreen before they bond with the fibres. Common mistake: tossing the wet suit into a plastic bag or a hot car — that traps chemicals against the fabric and speeds up damage. Checkpoint: the water should run clear and feel clean, not slippery.
- Step 2: Wash gently with mild detergent: Fill a basin with cool water and add a small amount of mild liquid detergent. Swish the suit gently for a minute, then let it soak for up to 15 minutes if it's heavily soiled. For machine washing, place the suit in a mesh bag and use a delicate cycle with cold water. Common mistake: using too much detergent or a harsh one — residue left in the fabric can attract oils and cause odour. Checkpoint: no suds should remain after rinsing.
- Step 3: Rinse thoroughly and remove excess water: Rinse the suit in cool water until no soap remains. To remove excess water, press it gently between your palms or lay it on a clean towel and roll the towel up. Never wring, twist, or stretch the suit — that's how straps and seams lose their shape. Common mistake: wringing it out like a dishcloth, which permanently stretches the elastane. Checkpoint: the suit should feel damp, not dripping.
- Step 4: Dry flat in the shade: Lay the suit flat on a drying rack or a clean towel, reshaping it to its original form. Avoid hanging it by the straps, which can stretch them out, and keep it out of direct sunlight to prevent fading. Common mistake: putting it in the dryer or leaving it in the sun — heat breaks down stretch fibres and UV fades colour. Checkpoint: dry until barely damp, then it's ready to wear or store.
- Step 5: Store clean and dry: Once fully dry, store your swimwear flat or folded in a drawer. Don't leave it compressed in a gym bag or a damp towel. If you swim often, rotate between two suits so each has time to recover its shape between wears. Common mistake: storing a damp suit in a sealed bag, which encourages mildew and odour. Checkpoint: a dry suit should smell fresh, not musty.
A note on coverage styles
- Flared Swim Dress Black: This swim dress is flared and long to cover tummy, hips, thighs, bottoms and baby bumps, with a wide band under the breasts for a nice silhouette and no special cup support. More fabric means more surface area to rinse and dry flat. The flared shape can trap water at the hem, so give it an extra gentle squeeze — never a wring — and lay it flat so the hem doesn't stretch.
- Long Tights Black: These self-banded long tights are designed not to slip or slide, with a size range from sm 8-10 to xxl 24-26 and specific waist and hip measurements. If you wear tights under a swim dress or for other water activities, the same care rules apply: rinse promptly, wash cool, and dry flat. The self-band relies on elastic recovery, so heat is the enemy.
Caring for swimwear isn't complicated — it's a few consistent habits. Rinse after every swim, wash gently, dry flat, and store dry. Do that and your suit will keep its shape and colour for many seasons, whether it's a coverage-focused swim dress or a simple two-piece.
