The Nelle Dress from Reformation is one sexy knit number, with peekaboo straps and a sweetheart neckline. Designed with the perfect cinch, this stunning style is simply irresistible (*sigh*). The Nelle Dress from Reformation is one sexy knit number, with peekaboo straps and a sweetheart neckline. Designed with the perfect cinch, this stunning style is simply irresistible (*sigh*). 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.