Allegra is getting us hot (in a good way). Knit from 100% cotton, this sleek, chic, and magnifique turtleneck sweater tank features a figure-skimming silhouette and just-toss-it-over-the-shoulder scarf. Allegra is getting us hot (in a good way). Knit from 100% cotton, this sleek, chic, and magnifique turtleneck sweater tank features a figure-skimming silhouette and just-toss-it-over-the-shoulder scarf. 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.