In 2006, Sophia Amoruso, a 22-year-old hitchhiking, dumpster-diving, community college dropout with a lot of time on her hands, launched an eBay store called Nasty Gal Vintage—a nod to bad-ass funk singer Betty Davis’ 1975 album. But this wasn’t your mom’s collection of cobwebby, shapeless tunics. Her fresh, edgy styling and MySpace savvy spawned a cult following of 60,000 fans. What began with a copy of Starting an eBay Business for Dummies, a steamer, and a knack for finding buried treasures among stuffy estate sales grew into a global brand. "Maybe Girl Boss is a new word for feminism."