The Reformation Boyfriend Sweater is a lightweight, fine-gauge knit made from a recycled cashmere blend, designed as the perfect layering piece with a relaxed, cozy fit. The Reformation Boyfriend Sweater is a lightweight, fine-gauge knit made from a recycled cashmere blend, designed as the perfect layering piece with a relaxed, cozy fit. 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.