This one was incredibly hard for me to do because I made it at college without a dress form (or anyone to help me fit it). I cheated on the back and just pinned it (with a button, still pretty appropriate for the character) to get the right look.
My favourite parts of the costume are the "Magical Moogle Hat" and the calculator holster on my thigh. I made both of them (unfortunately, I didn't make the calculator, but it IS a scientific).
None yet, but I got a lot of attention. I don't really think they give awards for "Sexiest Costume". ;-)