I purchased this a long time ago at a shop in Hawaii. The size is S, but I think it's closer to a small M. There's some elastic in the back. I've included a photo with a measuring tape, so please check the size. (Approximately 131.5cm from the shoulder straps to the hem) I've only tried it on, but it's been inspected by an amateur and stored at home for a long time. I would appreciate it if you could understand that this is a used item. It will be folded small and shipped in a bag, so please be aware of any creases. Thank you. ☺︎