Leather is pretty important for the quality of belts and shoes.  Do you own any leather products?
I still wear a leather belt that I have had for over a decade. I think it is cattle skin. But other types of animal skin is used for certain items.
It is often really important in cultures to use every piece of an animal after slaughter and leather is a tough material.  I know that people also use alligator and snake skin for shoes and purses.
For really fancy items, lamb and deerskin is used because it is so soft.  Those are items I probably would not be able to afford.
Yeah I definitely do not have the budget for lamb or deerskin.  I do have a faux snake skin purse that I really like.
Snakes can have some really interesting and ornate patterns. It is perfect for fashion items.  I personally prefer the faux version over using real animal products actually.