Boned, approximate size UK 12/14 but has three labels.
First one says size 26
Second says "100% polyester, Lining 100% cotton dryclean only"
final one says 19
So to avoid errors the approximate max circumference 77cm / 30 inches and measurements and condition are as shown in photos
This has been worn a few times, dry cleaned, stored in wardrobe, taken out a decade or so later, dry cleaned again and listed on eBay, our dressing as goths days are sadly now behind us 🤓