Im 55 with a bust size B-32, pant size 3 and weight about 128 pounds, to give you an idea of my metrics.

I ordered the xxs, per, the advice to order 2 sizes smaller than you're actually size.

Its a much nicer material than I expected!! I have no complaints!! The only thing I would add is, I wish the hooks were a little more sturdy and I wish they were actually slip hooks but over all I love it!! Cant wait to see the results :) until then, I love how it helps my posture and I like having the extra support.