Kors is only the latest in a wave of new fashion billionaires. In the last two years, names like Tory Burch, Sara Blakely (Spanx), Renzo Rosso (Diesel Jeans), Nicolas Puech (Hermes), Domenico Dolce and Stefano Gabbana (Dolce Gabbana), and the Cassegrain family (Longchamp) have all made the cut. They join the ranks of established fashion moguls like Miuccia Prada, Ralph Lauren, Gerard and Alain Wertheimer (Chanel), and Giorgio Armani.