More than likely, the Genesis coat that Gackt wears was indeed tailor-made...and would be quite expensive to duplicate if you are wanting to have real leather. There's a full replica of Genesis' outfit on display at the Square Enix building in Japan, but two things: It's in Japan, and it's probably not for sale. :/
Best of luck with your search.
EDIT:: If you were a woman, this would be so much simpler. I've seen quite a few long red leather trenchcoats for ladies.
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