I'll go with a regular dress and make it magical, which means that it's not a big deal if parts of it are see through (It will hide her naughty bits, not that she think so them as such, but it will be light and airy around the rest of the dress). Actualy, I see it a bit more as a Bikini of sorts with torn cloth strips hanging down from the top and bottem, that flow with the wind a bit, but still offer her some protection (The midsection would be loose but go from the top to the bottom, so it wouldn't blow completely open). It would let the air blow on her when she wants, give her protection, and give her a cool amazon look