As one of the many who's over the Halloween-as-opportunity-to-dress-trashy trend, I'd never push an ultrarevealing Halloween costume. Unless, of course, it's revealing for authenticity's sake, as is the case with the Holy Grail of sexy geek outfits: the Princess Leia gold bikini.
This handmade costume from Etsy pulls out all the stops, including making the metal-look bikini "top" out of sculpted clay and wire. It's $295 for the whole thing, which is pretty crazy for a costume, but if you're wearing this, you're already pulling out all the stops.
Sure, it's a bit early to be talking about Halloween, but if it's one of your favorite holidays (like it is for me), it's never to early to plan a truly knock-'em-dead Halloween costume.