Cut from lightweight cotton printed in fine red-and-white stripes, this is the kind of dress that makes you want to spend the day wandering. It has thin adjustable straps and a softly ruched neckline in front; in back, it’s gathered with a tie that lets you customize the fit. The silhouette is relaxed, falling to a midcalf hem. And it’s finished with an invisible zip and side-seam pockets, perfect for stashing whatever treasures (a pretty scallop shell, a cerulean shard of sea glass, a matchbook from your favorite clam bar) you might find along your way.