I think it has a pretty good amount of stretch. I can't be positive about the bust though since I have never been well endowed in that area >_<; there is lots of stretch through the top however so I think it would fit comfortably.
would you be charging a Canadian winner the difference in Price over U.S. shipping?? It shouldent cost more than about $2.25 more over U.S. postage for first class standard. :)