Clayton Harmony Slit Dress in White. - size M (also in ) Clayton Harmony Slit Dress in White. - size M (also in ) Cotton blend. Hand wash cold. Fully lined. Elastic empire waist. Front slit. CLYN-WD199. CLAYSU17 375DCS. With up-to-the-moment trends for the girl on-the-go, Clayton designs pieces that are just easy. Claytons no-fuss clothing line is full of mini dresses, casual maxis and attention grabbing garments that you cant be without.