This effortless dress is the perfect mix of modern and comfy with a casual-chic silhouette, a flouncy hemline, and plush stretch material. And it'll be the belle of the beach scene, too! Zenana's Sleeveless Shift Dress RS-9859P (in Size S--35'' long, from shoulder to hem) is made of 67% poly, 28% rayon, and 5% spandex and needs a hand wash to keep its cool.