It wasn’t long ago (maybe beginning of Age of Sorcery) that in a dev stream or video Dennis mentioned the backend issue with DLC armors and weapons preventing them from outfitting NPCs was fixed.
I’ve seen the Khitan headhunters but most of them are still wearing black Skelos robes. The only one wearing the Khitan headhunter armor is an actual roaming NPC (the others are the merchants/static NPCs).
Is this bugged still? (screen shot from single player, no mods)