Buying swimwear should feel exciting, not stressful. The secret is knowing exactly what to look for in fit, fabric, support and style – especially if you need long torso cuts, underwire support, tummy control or chlorine-resistant fabrics.

Use this guide as a checklist before you hit “add to cart” so your next swimsuit actually fits, flatters and lasts.

1. Fit: Size, Length & Long Torso

Good fit is the foundation of a great swimsuit. That means getting the right size and the right length through the body.

• Know your measurements: Measure bust, underbust, waist and hips, then match them to each brand’s size chart instead of assuming your usual clothing size will fit.
• Check torso length: If one-pieces always feel like they are pulling up, digging into your shoulders or giving you wedgies, you may need a long torso swimsuit with extra body length.
• Movement test: In the change room, raise your arms, squat and twist – everything should stay in place without painful digging or sagging.

If you’re between sizes, decide whether you want a tighter “swim training” feel or a more relaxed resort feel, and choose accordingly.

2. Fabric: Regular vs Chlorine-Resistant

Fabric choice affects how your swimmers feel on the body and how long they last, especially in chlorinated pools.

• Regular swimwear (nylon/elastane): Soft, stretchy and flattering; perfect for beach days and occasional pool swims, but elastane breaks down faster in chlorine.
• Chlorine-resistant (polyester/PBT blends): Firmer and less stretchy but far more durable in pools, often lasting several times longer than regular Lycra.
• What to choose: If you live in the pool, prioritise chlorine resistant swimwear; if you mostly swim at the beach or on holidays, regular fashion fabrics are usually fine.

Look for 4‑way stretch and a blend around 80–90% nylon or polyester with 10–20% elastane for comfort and recovery; for heavy pool use, choose chlorine-proof polyester/PBT.

3. Support: Underwire, Tummy Control & Structure

Support is where swimwear really earns its keep – especially for fuller busts or when you want extra tummy confidence.

3.1 Underwire & Bust Support

• Underwire swimwear: Built like a bra with wires and a firm underband, often in bra sizes (e.g. 12D, 14F) for precise support. Ideal if you want lift and separation.
• Wire-free with structure: Shelf bras, wide underbust elastic and powermesh can give comfortable support without underwire, especially in D–G multifit designs.
• What to buy: If you ask a lot from your bust support, look at our underwire and supportive swimwear guide and match your everyday bra size.

3.2 Tummy Control & Powermesh

• Tummy control swimwear: Uses powermesh lining, paneling and ruching to gently shape and smooth the midsection without feeling like rigid shapewear.
• Powermesh lining: Lightweight but strong mesh layered behind the main fabric to add 360° support and tummy control.
• What to buy: Look for styles specifically marketed as tummy control swimwear if you want a firmer, smoothing fit through the waist.

Remember: good support should feel secure and uplifting, not like you are being squashed – if it hurts, the size or style is wrong, not your body.

4. Style: Necklines, Sleeves, Coverage & Links

Once fit, fabric and support are sorted, style is where you fine‑tune coverage, sun protection and overall vibe.

• Necklines & bust: Underwire, balconette and plunge shapes boost lift; bandeau and straight necklines minimise tan lines; high necks add coverage and stay put in the surf.
• Sleeves & zips: Long sleeve and zip-front one-pieces offer extra sun protection and easy on/off, especially for active days and cooler water.
• Body length: If standard one-pieces always ride up or dig in, start with our long torso swimwear guide so your suit fits from shoulders to seat.
• Coverage levels: Check back height, leg line (low, mid, high cut) and bottom coverage (full, mid, cheeky) to match your comfort and style.

For bra-like tops, read the supportive swimwear guide; for pool-heavy lifestyles, see our page on chlorine resistant swimwear.

5. Your Swimwear Buying Checklist

Before you check out, run through this quick list to make sure your new swimmers tick every box.

• Fit: Does the size match your measurements and pass the movement test? Do you need a long torso option?
• Fabric: Mostly ocean and holidays? Choose regular nylon/elastane. Swimming laps or in pools weekly? Choose chlorine resistant.
• Support: Need bust lift or tummy smoothing? Look for tummy control, powermesh and underwire or structured wire-free cups.
• Style: Choose necklines, coverage and sleeve/zip details that suit how you actually swim, move and spend time by the water.

When you frame every purchase around fit, fabric, support and style – and know when you need long torso cuts, underwire, tummy control and chlorine-resistant fabrics – swimwear shopping becomes far simpler, and your suits will work harder for you, season after season.