You know those blue-and-white striped French Breton mariner shirts? With 21 total stripes (a tribute to each one of Napoleon's victories) they were an easy way to detect the whereabouts of any unlucky French sailor who'd fallen overboard on the high seas. Every chic woman I know owns one. If that shirt was a locket, this would be it. Rope detailing, elegantly understated and wearable every day.