I usually wear a size M, but there's no size label, so it might be a free size. It has a zipper in the back. The waist is elastic. I am 159cm tall and usually wear a size M. When I wore it, the length was knee-length. Please use this as a reference. I wore it once at a wedding and have kept it stored at home. Please understand that this is a used item that has been stored at home. Navy flare sleeve A-line party dress. - Brand: AuieF - Color: Navy - Style: Party Dress - Design: Flare Sleeve - Silhouette: A-line Thank you for looking.