Anybody speak French?

I'm trying to have a bit of (simple) French dialog in a story. The character is in a high school French class. Which is about as far as my knowledge of French goes. :-)

Due to the story a couple of words you wouldn't normally encounter in such a situation are going to come up. I've found the appropriate words in an online English-French dictionary. The problem is the *gender* of the words.

So, do I refer to a male-to-female transexual as "transsexuel" or "transsexuelle"??

Likewise, for a boy wearing girl's clothes, is it "travesti" or "travestie"?