Ellison makes it look easy. The sleeveless denim midi dress by Reformation showcases a notched collar, drop-waist silhouette, and western-inspired seam detailing. Ellison makes it look easy. The sleeveless denim midi dress by Reformation showcases a notched collar, drop-waist silhouette, and western-inspired seam detailing. 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.