COS Square-Neck Knitted Slip Dress – Black (Size M) Sold out online. This stylish black knitted slip dress features a chic square neckline and a comfy, stretchy fit. It has a bit of room, so I recommend it for sizes Large to X-Large. Super versatile and flattering for any occasion! Size: M (fits like Large or X-Large) Condition: Perfect, Like New Ready to ship! Message me with any questions!