You might need one. Keegan, a sleeveless top with a square neckline and wide straps, is a *stand-up act*. You might need one. Keegan, a sleeveless top with a square neckline and wide straps, is a *stand-up act*. Founded in 2009, Reformation is a revolutionary lifestyle brand combining stylish, vintage-inspired designs with sustainable practices. With each limited-edition collection, the LA-based brand empowers individuals who want to look beautiful and live sustainably.