We have long relied on truly great one-pieces come holiday season and believe that every summer box should contain one or two. Attention to detail is critical; choose a style that fits perfectly and is made from high-quality fabric that won’t stretch or sag with wear. It’s also worth looking for flattering detailing such as colourblocking, waist ties and bust support. Wear with slides when sunbathing, adding a beach skirt and jewels for cocktail hour.