What's sun-soaked, features cute clothes, and retro all over? Every Boy by Band of Outsiders look-book, and the latest is no exception. The celebrity model this time around is actress Greta Gerwig, pioneer of mumble-core cinema, former Paper cover girl and Lena Dunham interview subject and leading lady of Noah Baumbach's upcoming film Frances, Ha. In the Polaroids snapped by Boy by Band of Outsiders Creative Director Scott Sternberg, Gerwig frolics around the Hollywood Sports Paintball Park in the Spring/Summer 2013 collection, which features flowly, draped dresses tie-dyed with Japanese techniques. Below, see some of the pretty photos from the lookbook.