Soleil is soft and stretchy, if you're into that. This mini-length dress flaunts cap sleeves and an open back for a ready-for-anything outfit. Soleil is soft and stretchy, if you're into that. This mini-length dress flaunts cap sleeves and an open back for a ready-for-anything outfit. 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.