During the last gasp of summer, Cass Bird and Jorden Bickham headed to Long Island with a quartet of model pals (Andreea Diaconu, Mia Kang, Paloma Elsesser, Sasha Kichigina), a bunch of crocheted bikinis and tiny tanks, strings of shells, and a stack of the season’s most covetable relaxed denim. Those jeans and jackets, which here outfitted a little fun in the all-too-present sun, will also serve as your wardrobe staples post–Labor Day, as the silhouette loosens up shoulder to toe. Rejoice! In this one regard—the pulling on and zipping up—we can all breathe easier.