Getting into the store itself feels like an illicit adventure. Dial the studio’s number and someone will fetch you from the corner, leading you swiftly down a graffiti-splattered alley, through an unmarked door, and up a narrow staircase, until you reach a flowering rooftop patio—the perfect setting for your two-on-one consultation with designers Jim Searle and Chris Tyrell. Some of their recent confections include show-stopping reversible fox fur coats ($5,500), Gucci-esque suits, a christening gown made out of a vintage wedding dress, and a slew of party gowns (starting at $550).