With its focus on timeless style over short-lived trends and premium materials at sensible prices, COS' considered designs - from contemporary trousers, dresses, coats and knitwear to stand-out accessories, including bags, shoes and jewellery - are modern wardrobe classics.

Discover the best one piece swimsuits from COS, ARKET, Boden, REISS, Zimmermann and more. From flattering ruched swimming costumes, including one-shouldered styles, wide straps and halternecks, in block colours to statement Pucci swirls, you'll find our favourites here.