I been trying to get my fenris set going and noticing when I find in the mountains at night, they drop caves or trophies. Why not hair too. Some frost caves have some hair but you think the monster itself would drop the hair too. Not all mountain area has frost caves. If they are not dropping hair, I just avoid them not worry about attacking them. I got hand full of claws and few trophies.
Trying to figure if the armor set worth it or just make padded armor and be done with it. Fenris armor up to level 2, all 3 items.