My first and presently only attempt to make any form of costume for a steampunk themed ball I went to earlier this year. I wasn't dressing up as any character I know, just a general mad steampunk scientist sorta look.
I have a Nerf Maverick pistol with a bunch of hoses and cables and on my arm and belt I have a flamethrower/shotgun device. Not functional of course, but the nerf gun still fires!
Unfortunately a lot of this got a bit broken in the car on the way back, but I looked the part at the ball. My only regret was not starting to grow my goatee a bit earlier, it's pretty thin here and it doesn't quite look sophisticated enough. That and I have a pretty huge head. That hat is a size XL and it's still not really big enough to sit comfortably.
Haven't submitted this up until now because all the photos I have are pretty terrible and I couldn't be bothered doing a proper background.
PS. That coat is kinda an heirloom of mine. My Dad got given it by his Dad when he was at university and now he's passed it on to me for uni.