The Cello Knit Top has ruched detailing and a sleek, off-the-shoulder design for timeless appeal. The Cello Knit Top has ruched detailing and a sleek, off-the-shoulder design for timeless appeal. 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.