For a custom armor set I'm working on, I'm using Khan Raider's Ebony Hoplite Armor as a resource (permission pending), specifically the helmet, but whenever I try to add any texture other than the default, it just shows up as white in-game (though it looks fine in NifSkope). I have literally never encountered this problem before, and I've been banging my head against the wall trying to figure out a way around it because the set really doesn't work without it.

Has anyone ever heard of something like this/know a workaround?