We’re in favor of secret weapons, both sartorial and otherwise. Take these tricolor Docksides, for example. From the outside, they’re cream-white with almost invisible spots of blue and red. But once you take them off—either at a fastidious friend’s house or at the close of a long day—you’ll unveil the most interesting feature, the powerfully blue-and-red insoles. It’s one of our favorite tricks, also at play in paisley jacket linings and intricate socks. The most important rule: tell no one.