Women's Swimwear & Beachwear

Swimwear for Women, Designed to Flatter

Every piece in our swimwear collection is designed with fit and confidence in mind. Think supportive underwiring, adjustable straps, ruching in all the right places, and cuts that work with your body rather than against it. Whether you prefer a classic triangle bikini, a high-neck one-piece, or a bandeau top with tie detailing, you'll find a style that suits your shape and how you like to wear it.

We update our swimwear edit regularly with new colourways, prints, and silhouettes, so there's always something new to add to your holiday wardrobe.

Fabric and Quality

Our swimwear is crafted from a premium 82% polyester, 18% elastane blend. This combination gives you the best of both worlds: polyester for durability and shape retention, and elastane for that essential four-way stretch, so your swimwear moves with you in and out of the water without losing its fit.

Care instructions: to keep your swimwear looking its best, wash on a low temperature with similar colours and fabrics. Avoid harsh detergents and high heat, which can weaken the elastane fibres and cause colours to fade over time.

Size Guide

Choosing the right size makes all the difference with swimwear, so use the guide below before you shop:

• XS — dress size 4/6
• S — dress size 8/10
• M — dress size 12/14
• L — dress size 16/18

Between sizes? We'd recommend sizing up for the most comfortable fit, especially with structured styles like underwired bikini tops.

Styling Your Swimwear

Swimwear isn't just for the beach. Here's how to make the most of your Kaiia pieces beyond the pool:

• Layer up for travel days: Throw one of our cami tops or crop tops over your bikini top for an easy transition from sunbathing to lunch.
• Build a beach-to-bar look: Pair a bikini set with our high-waisted shorts or classic shorts for a coordinated, holiday-ready outfit.
• Cover up in style: A simple t-shirt worn open over a one-piece is an effortless way to move from the sunbed to the beach bar.
• Complete the look: Browse our full range of tops to mix and match with your swimwear for versatile, holiday-ready outfits that work day into night.

Returns

Not quite the right fit? You have 28 days from receipt to return unused items in their original condition. A £2.50 deduction applies to cover the return label cost, and the hygiene sticker must remain intact for swimwear returns to be accepted.

Purchased via TikTok Live Shopping? Please return through the TikTok platform, as we're unable to process these returns any other way.

Returning via Royal Mail (£2.50): Generate a return label via the Royal Mail website, attach it to your parcel (covering any old labels), then drop it off at your nearest Royal Mail location. Keep your proof of postage in case your parcel is lost in transit.