Leather is as important as Linen to get your armor sets in Ghost of Tsushima upgraded. You need more Leather the higher the upgrade-level. All requirements for upgrades can be found at any armorer, this is the place to upgrade your armor.
An overview of all trophies can be found here. Back to Ghost of Tsushima – Overview for Collectibles, Armor, Weapons, Resources.
Here is a Overview for how to get Leather:
There are not many ways to get Leather but see below all few ways to get it.
- Leather can be bought from Trappers in exchange for Supplies, so make always sure to gather all Supplies crossing your way.
- Leather can be found at all Enemy Camps but it is rarer than Linen. The most common spot are the sleeping quarters at the enemy camps.
- Leather is a common Side Tale reward. The reward can be Linen, Leather or Silk, simply check your quest when you scroll over a quest icon, then you will see the reward for completing the quest.