Growing up in Tampa, Florida, with David Bowie posters on her wall, Dianne Brill sensed she didn’t quite fit in. Around 1980, she discovered a store with a basement full of never-worn clothing from the 1940s. She bought it all, then lugged the “body bags’ ” worth of vintage to New York City to sell at Patricia Field’s Lower East Side boutique and at Trash & Vaudeville. “I sat there with empty bags and a handful of cash, and I thought, I guess I’…