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.
It is prized for its mirror-like finish and anti-creasing properties.
Lamb and deerskin are used for soft leather in more expensive apparel. Deerskin is widely used in work gloves and indoor shoes.
Reptilian skins, such as alligator, crocodile, and snake, are noted for their distinct patterns that reflect the scales of their species. This has led to hunting and farming of these species in part for their skins.
Kangaroo leather is used to make items that must be strong and flexible. It is
, shearling, cashmere, angora, mohair, and a number of other fine wools), fur, feathers, pearls, animal-derived dyes, leather, snakeskin, and any other kind of skin or animal product. Most leather clothing is made from cow skins. Vegans regard the purchase of leather, particularly from cows, as financial support for the meat industry. Vegans may wear clothing items and accessories made of non-animal-derived materials such as hemp, linen, cotton, canvas, polyester, artificial leather