Part of the Net Sustain edit on Net-a-Porter, Peony's swimwear is now recognised by big retailers for its conscious credentials. Made from Econyl, this Strapless Cutout Floral-Print Stretch-Econyl Swimsuit (£180) is equal parts sexy as it is sophisticated. Each piece is designed to transcend seasons, meaning it will never go out of style, and even the packageing is compostable, made using plant-based materials such as cornflour and wheat.