Hi,
I am going to be in a belly dance show. The required top of my costume is way too small. It is a size Large but it is too small everywhere

especially in the bust.
Is it possible to take the top apart and add fabric to each individual piece and then sew it all together? I bought an extra top to use for fabric. I am willing to try anything. I haven't had much luck with local alterations shops. I am desparate because if I can't make the top work, then I can't be in the show. I appreciate any suggestions. Here is a link to what the top looks like.
http://cgi.ebay.com/LUNA-CHIX-BOLERO-SHRUG-SHORT-CARDIGAN-SIZE-SMALL-NWT_W0QQitemZ110354090226QQcmdZViewItem