For context, I'm working on a character based PVP game, and I would like to be able to change a players skin to the 'character' for visual clarity and polish. I'm currently using custom textured armor to do this but the lack of a second texture layer on the arms is pissing me off, they end up looking weird and blocky and I can't add any sort of depth such as pauldrons or shoulderpads, (I'm using custom player heads rn to get around that stuff for the head).
I did some googling around and all the results I get are just how to change your skin manually in the launcher, which does not help me. I figure this sort of thing is probably just not possible at this point, but I haven't been paying close attention to the updates lately and I don't know if this was something they added a method for.