Guess Lace Dress Size 12 kids

Lace Guess brand dress. I think this fits more like a 10 than 12 (kids). Zip up back, some slight discoloration near zipper, but I only see it on the inside of the dress (see picture). This is an off-white dress. It looks like it originally had a sash of some sort, but that is not included. Sleeveless.