OMG! I don't think I could breathe with this on if I weighed 90 lbs at 5'5. I even tried stretching the elastic for 3 days.  I love, love, love this but it's an xxxs.  If I pull it up to where my bra goes (34C) I still can't breathe. I really wanted this to work. I'm 125 lbs. hourglass 5'5