The usual Catwoman size issue

On Saturday somebody came to possibly rent a Catwoman costume that I have got. The problem was, that the medium sized costume is too large for that person. This has happened before and seems to be the third time. I really need to get the small version of that to have any success with it.

I have two Batman costumes from the animated series, where both costumes are a medium size, but the costume with the muscle chest is too big and the costume without the muscle chest is too small. Both Batman costumes come from the same manufacturer.