There are a few pics that I seen that can show clothes under armor.
There is one pic of an archer sneaking up on an Elk or something. He is wearing a yellow sleeveless hoodie (Maybe it was hair, but it didn't look like it), and some baggie greenish pants.
On another picture we see a man in a horned helmet. Well, we see his back. Under his helmet we can see said yellow hoodie (once again assuming it's not hair) and under his thigh armor is greenish baggy pants.
I just think this would seem like an odd coincidence to have very similar clothing in a set of armor.
Post any evidence you have here. Maybe we can get a solid idea.