Jaelynn is a thigh-length mini from Reformation with a boatneck, long sleeves, and a slim fit. Jaelynn is a thigh-length mini from Reformation with a boatneck, long sleeves, and a slim fit. 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.