Any armor requires leather and wool

For armor to protect you need:
1. Clasp, without leather straps, how do you put it on yourself?
2. Cushioning, without a woolen backing, underarmor injuries are inevitable.
I suggest adding wool and leather to the crafting of any element of armor, this will encourage players to get out to the surface from the mines before getting armor, and also make these two not-so-demanded resources more needed.