If you want to believe asmus they don't use leather or pleather, but rather something they developed themselves
https://www.facebook.com/share/v/1tJ47LTsGE9Mi5Mq/?mibextid=D5vuiz
I've found some of the jiadou bodies to be taller than 1/6 scale which is what you would need. Other than that there was a limited run of sephiroth bodies I believe which in themselves are just gametoys ichigo bodies with a hole in the back for the wing.
As of right now: you don't. They were only on taobao and already sold out. Kit said he'll get some but we don't know how many and he's not getting any arms.
Reddit seems to say they are fine. Not surprised they don't take paypal. They take google pay or stripe though.
I searched using this:
https://world.taobao.com/item/788891139765.htm
Should pull up the item
I might just use superbuy. If I can get one from kit too that's fine. Looks to be about 130 for a body and one set of arms. That's before agent fees though.