Stupid me!

The next wedding, actually my brothers is coming up next weekend..So I thought myself very, very clever..Im not that kind of girlie who goes shopping all the time, but when I go its for sure that the piece of clothing I buy is a bargain but far too small for my chocolate-addicted body!
So how can I squeeze myself into this superb xxs-ish top?
Are there any suggestions?
In the meantime I try to avoid any confrontation with chocolate and friends..at least till the end of the week!