NWT Sz XS Free People Intimately Black Knockout Swit Slip Knit Mini Dress Features: Stunning body-hugging slip dress featured in a sweater knit design with flattering seam details, crochet trim, and an open back with crisscross straps. Pull on style with stretch fabric in Black Size: XS Condition: New with tags, no flaws. Tags: Revolve, Dolls Kill, Beach, Swim, Cover up, Pool, Vacation, Cruise.