So, gentlemen. (My dad, brother, uncles, friends, groomsmen, male dates, etc.) Here are some critical elements to Steampunk your outfit. While many of these examples single out grooms, they are obviously perfectly appropriate for anyone of the male persuasion.
And this one!!
I also have some tips on our wedsite. You can jump over to that page here.
And, of you feel particularly unenthusiastic...(I would advise you NOT to be...):
Top hat. Cane. Vest. Spats. Ascot. Pipe. Goggles.
But definitely a suit.