Oak's Pelt

Oak's PeltLeather Armor
Proficiency	Light Armor
Armor Class	0
Armor check penalty	0
Arcane spell failure	10%
Max Dexterity	6
Qualities	Enhancement +3 +5 Armor Class
Effects
This +3 leather armor gives the wearer a natural armor bonus instead of an armor bonus.
15 lbs.
Sell: Buy: 5,250

Oak's Pelt is magic armor in Pathfinder: Kingmaker.

Source

Found in the depths of Lostlarn Keep (Varnhold's Lot DLC). Can be bought back in the main game from the Goblin Merchant.