So my measurements indicated one size and my weight another.  I went with the weight one and should have stuck with the measurements instead.  The one that came ran larger than the measurements listed and is like wearing a tent.  I bought this for a child's birthday party and it will do the job but it is a little on the cheap side even for a cheap costume.

UPDATE: After wearing the costume for two hours at the party the "leather" parts started to smell like old fish.  It was gross!  I would not buy another one!