Sneakers on the runway! You've heard that line before. (Trainers have had a good year so far—see Dior's and Chanel's Fall Couture collections, for starters.) But in the case of today's terrific Alexander Wang show, it means something new. Wang, a sneakerhead if ever there was one, used the sporty shoes as a leitmotif, reinterpreting iconic styles as clothes. Nike's familiar Flyknits were reimagined as clingy body-con dresses in electric colors, while the signature white and green of Adidas' Stan Smiths became—what else?—tennis dresses.