An obsessive new discipline is permeating fashion this season. Championed by the masters of subversive restraint like McQueen, Givenchy, and now Louis Vuitton, it’s no longer about the throw-on. Look instead to all things considered, with every detail meticulously finished—tiny, bound waists, leather straps, fetish shoes. With roots in the aristocratic-Brit-punk of English eccentrics, it’s a celebration of the art of fashion