Coco Dress. Crafted in Stretch Viscose Mirage Print. Crew neck sleeveless dress. Exposed back zipper. 54% Cotton, 43% Viscose, 3% Elastane. The MILLY Coco Dress is cut from the gorgeous Mirage print, pairing candy-colored accents with bold, dark stripes. An easy transition from day to night means throwing on some heels and a necklace. That's why this sleeveless dress is on our wish list. Dry clean only.