XS! But can fit a S if you unbutton the first top button like me! So cute easy to dress up or down! Sleeveless denim A-line mini dress with full button-front closure and V-neckline. Versatile for casual outings, brunch, date night, or weekend errands. Features a relaxed, vintage-inspired silhouette with classic pearl-tone buttons. Denim mini short dress casual boat day casual sexy dinner Labor Day fit country Windy City state fair