The Casette Silk Dress from Reformation is a sleeveless, midi style with a cowl neck, side ruching and an open back. The Casette Silk Dress from Reformation is a sleeveless, midi style with a cowl neck, side ruching and an open back. 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.