The size is a size 11. It's easy to take on and off with the back zipper. The back panel has elastic. Flat measurements: Shoulder width: 37cm Bust: 45cm Sleeve length: 40.5cm Length: 100cm Please note that there may be slight variations due to amateur measurements. I only wore it once for a wedding. It was stored in a closet without being put in a bag. Please consider carefully before purchasing if you are concerned about minor details due to home storage. Shipping will be either Yu-Yu or Rakuraku Mercari delivery.