we need reference pictures XD
if it is, I like his jacket already! :0
I would add rufflies to his undershirt, maybe look up a victorian men's trouser ?
The tie can be a scarfy thing instead.
making the weapon bronzed would look cool. maybe the ribs of the skeleton could be wires instead, and go from there to make it more mechanical
you could turn the glasses into some mad scientist googles, or make fancy opera glasses. maybe the braid thing can be a chain from glasses instead.
I think the jacket is a huge part of the costume and looks good already.. keep all the buttons~