Warm-weather dressing is made effortless with Acne Studios's midnight-blue sateen Debrah shirtdress. It's given a graphic twist with swirling white paisley motifs and has a loose silhouette that's accentuated with airy elbow-grazing sleeves and a flat step hem. A quick change of accessories will take it from vacation to city - simply swap flat sandals for chic black mules.