Living in harsh enviornments without many ressources to forge iron weapons or armors brings individuals to use other materials. The Trophy Hunter armors are made of various bones of different creatures. Usually hardened by magic those skulls, leg bones or fangs can be a good protection, decoration and fearfull weapon in one. But even if no magic is used those armors and weapons can be something. But in a case like that the owner needs to prove a lot of braveness. Unenchanted bones are not as protective as steel or leather. But often made of creatures, the owner hunted down himself those armors show, the skill of any warrior, headhunter, wanderer or stray in one view. And best thing: No armor is like another. They are all fully unice.
(If you wonder why 7 and 8: I have some more sets made on dA)