The Reformation Cashmere Boyfriend Sweater is a lightweight piece with a relaxed fit, designed for effortless layering and comfort. The Reformation Cashmere Boyfriend Sweater is a lightweight piece with a relaxed fit, designed for effortless layering and comfort. 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.