According to prominent fashion stylist Kalyn Johnson, Tory Burch has done for the ballet flat what apple did for portable music players. "Each season she really ups the ante with different textures, stitching and colors," she explains. "They fly off the shelves, just like iPods." It's no question: the hip, chic, comfortable Reva Ballerina Flat, priced at $195, is here to stay.