Reformation's Sunna dress is a long-sleeve style with a tie at the neckline and a slightly flared silhouette. Reformation's Sunna dress is a long-sleeve style with a tie at the neckline and a slightly flared silhouette. 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.