My suggestion is to find a custom dressmaker and commission to have this coat made for you. I am fairly certain that this style never actually existed outside of anime.
It is pretty damn sharp though, and I think there should be people wearing a few of these outside of OtakuCon or the like.
What I'd do if I were you is to get some manga that feature this character, or even print out the very images you posted to this thread, and take them with you on you consultation with a dressmaker. I do know for a fact that it is perfectly feasible to replicate this coat. It would not be cheap, I promise you that, but it could be done, and it would be insanely awesome, and you would get compliments whenever and wherever you wore it.
This is not me, nor my work, just some awesome dude I saw at DragonCon.
If I were doing it, however, I'd make the coat of worsted wool with a satin lining and brass buttons. His coat is pretty awesome, but yes, it is cosplay, not a real, honest-to-goodness winter coat. I still maintain that it would be feasible to make a regular coat after this fashion.