Basically, some characters have pale white bodies in the armor sets that expose a lot of skin, such as the raiders. Their heads and hands are all correct though.
I've double-checked that I've got Archive Invalidation check in Mod Organizer. So I'm not sure what the problem is. I'll post a screencap of a corpse as soon as I encounter another one. Basically, it's the old "pale head" issue, only inverted.