forced to wear embarrassing clothes by curse or magic.

[PyroWildcat]

If a written scene works for you, I did something like that not too long ago on the BEAddventure. It starts here: http://old.bearchive.com/~addventure...9/1289002.html

And, luck may have it, I'm planning on adding to this storyline later today.

Also, the series that that scene is based off of, Kill la Kill, kinda has what you're looking for as well. The main protagonist has an outfit that changes into a really skimpy battle form which she finds embarrassing for the first few episodes; then again, she does still wear it by choice, so maybe not exactly what you have in mind here.