Swimwear UK: Choosing a Swimsuit That Actually Stays Put in the Water
Most swimwear looks great dry but shifts the moment you swim. Here's how to choose a swimsuit that actually works in the water.
SHOPTHIVA Editors
Why most swimwear disappoints in the water
There's a moment every swimmer knows: you dive in, come up for air, and realise your swimsuit has shifted somewhere it shouldn't. The top has ridden up, the bottom has shifted, or the straps have come loose. You spend more time adjusting than swimming.
This happens because much swimwear is designed for appearance, not function. Thin straps, minimal elastic, and fashion-focused cuts look great on a beach chair but fail under water pressure. When swimming — even casually — water creates drag that pulls at every loose element.
The fix is choosing swimwear designed with both function and appearance in mind. Proper elastic, secure straps, and structured cups that stay in place make the difference between enjoying your swim and fighting your swimsuit.
What to look for in functional swimwear
Strap design is the first consideration. Adjustable straps that can be tightened to fit are essential. Fixed straps that can't be adjusted will either be too loose (and shift in water) or too tight (and dig into your shoulders). Look for straps you can customise to your body.
Bottom coverage and cut matter for water activities. If you're swimming, the bottoms need to stay secure. Higher-cut legs look elegant but may shift during active swimming. Moderate coverage with a secure elastic band stays put better than minimal coverage styles.
The fabric should have adequate elastane content — at least 15-20%. This provides the stretch and recovery needed to maintain shape both in and out of water. Swimwear with low elastane content sags when wet and doesn't snap back when dry.
A swimsuit that balances style and function
The Sexy Leopard Bikini Suit on SHOPTHIVA features adjustable straps and a push-up design, which addresses the core functional issues. At £21.49, it's an affordable option for holidays, pool days, and beach trips.
The three-piece design (top, bottom, and accessory) offers versatility. You can mix and match pieces with other swimwear you own, which extends the practical use beyond a single set. The leopard print is a bold choice that stands out without being trendy enough to look dated next season.
The push-up design and strap construction are the functional details that matter. A push-up structure in the top means it maintains shape in water rather than going flat, and the straps provide the adjustability needed for a secure fit during swimming.
How to care for swimwear so it lasts
Rinse after every wear — even if you didn't go in the water. Chlorine, salt, sunscreen, and sweat all degrade swimwear fabric. A thorough rinse in fresh water after each use removes these chemicals and significantly extends the life of the swimsuit.
Never wring swimwear. Twisting to remove water stretches the elastane fibres and distorts the shape. Instead, press gently between your hands or wrap in a towel and press to absorb excess water. Lay flat to dry away from direct sunlight.
Hand wash with a gentle detergent. Machine washing, even on delicate cycles, can stretch straps and damage the elastic. A quick soak in cool water with a mild detergent is all swimwear needs. Avoid bleach entirely — it destroys elastane.
Sizing swimwear correctly
Swimwear should fit snugly when dry because it will loosen slightly when wet. Water relaxes the fibres, and the weight of the water pulls the fabric down. If your swimsuit is already loose when dry, it will be worse in the water.
If you're between sizes, size down rather than up for swimwear. This is the opposite of most clothing advice, but it's the right approach for swimwear specifically. A snug fit means the suit stays in place when wet, rather than sagging and shifting.
Consider your activity level. If you're swimming laps or doing water sports, a more compressive fit is better. If you're primarily lounging by the pool, a slightly looser fit for comfort is fine. Match the fit to the primary activity.
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Frequently asked questions
How do I stop my bikini top from shifting when I swim?
Choose a bikini top with adjustable straps and a structured design (like push-up cups or underwire). Tighten the straps so the top sits firmly without being uncomfortable. Fixed, non-adjustable straps are the most common cause of shifting. Also ensure you're wearing the right size — a top that's too loose will always shift in water.
Can I wear a bikini in a swimming pool?
Yes, bikinis are perfectly suitable for swimming pools. The key consideration is chlorine resistance — rinse your swimwear in fresh water immediately after pool use to remove chlorine, which degrades elastane over time. A well-fitting bikini with adjustable straps stays secure during normal pool swimming.
Should I size up or down for swimwear?
Generally, size down if you're between sizes. Swimwear loosens when wet, so a snug dry fit becomes comfortable in the water. A swimsuit that's loose when dry will sag and shift when wet. This is the opposite of most clothing sizing advice, but it's specific to swimwear because of how water affects the fabric.






