When vacationing in France and enjoying a day of sunbathing with your best friend, the key is to dress effortlessly. Karlie Kloss knows best [1] — just look at the striped halter one-piece she wore poolside. Derek Blasberg snapped a photo [2], and of course Karlie struck the perfect supermodel pose, allowing us full view of her flattering suit [3]. From its alluring cut to its sophisticated pattern, which conjures images of the iconic striped bateau top, it's safe to say Karlie's design belongs in France — and our own swim drawers too. Read on to get inspired by Karlie's Parisian style [4], then shop similar pieces.