Thank you for viewing. It says "free size." When compared to a size 80 item from the same brand, Miki House, they seemed to be about the same size, so I've listed it as 80, but I'm not entirely sure. It seems the back string can be used for adjustment. It was a gift, but I didn't use it. Flat measurements: One-piece dress: Shoulder width: approximately 20cm Body width: approximately 35cm Length: approximately 32cm Bloomers: Width: 25cm x 20cm ● Size and Material: Please refer to the images. ● Condition: Please understand that this is a used item before purchasing. ● Other Notes: There are no smokers in the family. There may be traces of name sticker removal or erased names on the tags. If it feels sticky, please apply a new name sticker over it. Also, I try to make the colors as similar as possible, but there may be slight differences from the images. This is not intentional. I also try to check carefully, but there may be oversights. Thank you for your understanding.