This costume was a HIT!! I wear a size 10, am 5'6" and weigh 185 lbs. I have a smaller chest, bigger arms, bigger arms and big booty. I ordered the Adult Plus as that was all that was available in this costume thinking I may have to take it in.
The costume came in a XXL and the fit was surprisingly ok. The chest was a little big for my 36C chest, but the hips of the jacket fit perfectly (I'm about 43" in the hips). It came with an adjustable belt, but I used one that I had on hand bc it fit better. The pants were roomy, but not too big. I added my tall boots and a beard set. It worked great. People didn't even recognize me until I spoke.
This costume doesn't breathe, so it gets kinda hot. That didn't stop my friends from lining up to sit in my lap and take pics!