I found these cute tops on sale at Etsy. These are in case you want to go as a samba dancer or showgirl, and still be decent, at least by New Orleans Mardi Gras standards. The first one is available in the normal range of different sizes!
Guys are not likely to cop a feel on the street if you wear this one:
This one is nice:
The next one, alas, comes only in D-DD. So you have to be a big girl for this one. Still, it's pretty.