Coastal Maxi Dress Apt Collections Maxi dress with open back Sewing Lab Milano Open knit cotton maxi dress in white Erdem Mytheresa Navy Maxi Dress with Crochet Top and Open Back Maxi Dresses Saved Womens The Coastal Cami Maxi Dress made with Organic Cotton Pact. Coastal Open Back Cotton Maxi Dress delivers breezy coastal elegance with barefoot comfort. Designed for warm shorelines and slow days, this cotton maxi features slender straps, a deep V neckline, and an open back that cascades into a voluminous, gathered skirt. Lightweight and unlined for maximum breathability, its a forever summer favourite.