.... that's dark muggy. humans? i thought it was made from tanned brahmin hide...
Well think of it this way.
Do you have skin? Yes.
Most mammals/reptiles have some external covering of their body. Basically that is a hide if skinned.
Just dry it out, apply some liquid in which will cause it to harden & stay flexible, & ta da. You have leather. It really doesn't matter where it came from. The end result tends to be the same.