The Reformation Brynn Dress is a midi-length A-line dress, featuring cap-sleeves and a V-neckline. The Reformation Brynn Dress is a midi-length A-line dress, featuring cap-sleeves and a V-neckline. 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.