The Reformation Brittany Denim Mini Dress is a chic piece featuring a halter neckline, button-down front, and relaxed A-line silhouette. The Reformation Brittany Denim Mini Dress is a chic piece featuring a halter neckline, button-down front, and relaxed A-line 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.