I'm glad to see other Steam Punk people here!!!!!
I go to Chornonaut here in san diego on a regualr basis.
My "costume" isn't very outlandish....I have a brown leather hat, black chefs jacket(trust me it works) brownish pants, calf high "captain's" boots, thick black belt with a 1890 Cutlass with scabbart.
I'm going for the "adventurer/swashbuckler" type look.
I'm working on a steam powered ray gun and I'll switch between the cutlass and the gun.
I'm also learning how to sew my own stuff, so far I have made a steampunk vest (not so good...first try), 1890 era pants, with "braces" to hold them up, and last night I started sewing an 1890 era shirt.
I'm going with the plain work shirt this time, when I get better at tailoring, I'll make a dress shirt. then go back and make a better looking vest with brass buttons etc...
Remember the motto, "Steam Punk is Victorian with Brass, Glass, Wood, and imagination."
Have Fun!!!