Go to Target or Walmart, buy a neoprene waist trimmer belt... they carry them in the sporting goods department. They tend to go for between 6 and 10 bucks, and bind incredibly well, considering. I have between a B-C size chest, and one of those belts flattened it to nothing.
I would, however, advise that you wear at least a wife beater underneath; those things can cause blisters if they're right against your skin. And if you have a problem with the velcro closure sticking out, try duct tape (but NEVER on your skin!).
SD