Wow, this screams 1970’s. Size large and it’s in excellent vintage condition too. It’s hard to do an armpit to armpit measurement on this because there really aren’t any armpits, but my mannequin has a 35 inch bust and this seems a little bit big for it. I would say the bust is meant for someone with a 36 through 37” inch band with a B through D cup size. The rest of it really isn’t fitted at all and would fit almost any size.