It's looks pretty accurate and I certainly wasn't expecting anyone to be doing Booker this early with the game just coming out. So extra brownie points for that.
Outfit wise everything is pretty spot on. But for the vest, I'm not really sure how the phrase it. But when I think early 1900's, I'm thinking duller colors and more ragged looking. Of course that's just what I think.
Otherwise awesome cosplay.
When in doubt, just take the next small step.
With that next step take a deep breath. It calms the mind.
When the mind is calm you realize the best is still yet to come.