They're very similar to level 35-50ish subligar, like the level 37 Boarskin Subligar, the level 42 Piesteskin Subligar, and the level 47 Raptorskin Subligar. Basically they're easy enough to acquire - npc shops in Coerthas or Mor Dhona should sell them, or you could buy them on the Market Board (you might even score some from levequests as a reward, or the aetheric version in a treasure chest during a leve).

All these can be dyed easily too to get the same look.