Saw 'Iron Man suit' as I was scrolling to the reply to thread area. Made me think for a second, but I agree--it'd be sweet to be able to fly and stuff...
Otherwise, I was gonna say Batman's Grappling Hook. Or better yet, Batman's Utility Belt with his grappling hook and everything else still on it. And his cape. I can get my own tights, it's cool. A man should never wear another man's tights.