Cinderella’s signature slipper, meanwhile, is made of crystal, designed in collaboration with Swarovski, and based upon a shoe from the 1890s that Powell found in a museum in Northampton. That shoe had a five-inch heel and no platform. “So besides the fact that Cinderella’s slipper is crystal, the shape of the last makes it impossible to walk in,” Powell says. “I was amazed that I was allowed to do it—that nobody wondered how they were going to reproduce it for children. But then,” she muses, “I guess the glass slipper is the ultimate fetish shoe, isn’t it?.