An above-knee A-line dress on thin spaghetti straps with a deep V open back — the back drops low and is finished with a drawstring tie at the base rather than a fixed seam, so the opening can be loosened or gathered in. The body falls loose from the shoulder with no waist seam, giving it a breezy, unstructured swing that suits warm-weather, relaxed occasions. The lightweight cotton-blend has enough drape to move with the body without clinging, and the adjustable back tie means you can dial in exactly how open you want it to sit. It's an easy vacation dress — throw it on over a swimsuit or wear it alone with sandals for dinner.