I'd wear most anything from most any Sci-Fi, as long as it isn't a red shirt from Star Trek TOS. I don't wanna die.

Ensign Elspode please accompany Mr. Spock to the surface.

I like the Firefly Wild West gear.

Ziggy Stardust was martian... duzzat count?

I've always desperately wanted the scarf Tom Baker wore as Dr. Who. I've been tempted to learn to knit (and have tried to trick my SO into learning it) *just* to achieve that little bit of nerdness. I've seen a pattern out there...

Edit:

Ah! This one! Instructions and all.

I'll make that for you for 300.00.

I have always wanted Lady Arwen's wardrobe. All those rich velvets and stuff...and I would want hair like that too...mine just wouldn't look right if it were that long. It would be like a few pieces of yarn.

Absolutely Wonder Woman's costume

The hydraulic suit that Sigourney Weaver wore in Aliens.

I shovel very well.....

Boba Fett. C'mon, you know it would be cool.

Any of these:

Wow. You're baaaaaaaack...

On a different note, I, too, would love to wear that powersuit.