Xhilaration Shortalls- Size M/L

These are a cute pair of Shortalls. They do not have a size tag. I am a size 12 and they are tight on me. I would guess them at a 8/10? They have the usual adjustable adjustable straps. There is a small stain on the back of the pants, please look at the picture. I have not attempted to remove it. The hips are 38 and the inseam is 3.5.