The Reformation Rylie Cotton Sweater Tank is a mid-weight ribbed knit with a flattering V-neckline. The Reformation Rylie Cotton Sweater Tank is a mid-weight ribbed knit with a flattering V-neckline. 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.