Sadly i could not find any (and i mean "any") sort of jacket/etc like this, but i'de like to suggest a few things.
1. this does not seem to be a jacket to me, as much as possibly a hooded-cape with sleeves.
2. for the Meda-bat monster next to him (don't know if your gonna make or have one) but you could probably make a small plush toy of it easily.
3. i would suggest possibly looking for a commissioner if you have the time, and the money. (if you do decide to do the commissioner, drop by the com. forum on here to find the one you think is best, they will be graded on there work done so far and will usually be some reviews).
4. if you want to really go all out you could probably take some really thin wire and attach the wire to a part of your costume, and to the Meda-bat monster to make it look like its flying.
Anyways there not really what you asked for but i hope this atleast was kinda helpful, also thanks for giving me an idea of a future cosplay ^^ Good-Luck!
Hooded-Cape with Sleeves Reference Pictures Via Google Images (Link Below)
P.S. It seems like either making or hiring will be the best choice...