Leather

Leather is an animal skin used to make armor and books.

Drops from animals
Cows, mooshrooms, horses, donkeys, mules and llamas drop 0-2 pieces of leather upon death.

Fishing
Leather can be obtained as a "junk" item from fishing.

Trading
Leatherworker villagers will buy 9-12 leather for an emerald.

Repairing
Leather armor can be repaired with leather in an anvil. Elytra can also be repaired with leather in an anvil.

Issues
Kůže Leder Cuero Cuir Bőr Cuoio 革 가죽 Leer Skóra Couro Кожа 皮革