The Leather Cap is a light armor headgear in Final Fantasy XII that slightly boosts the wearer's magickal defense and HP. It is the weakest light armor hat in the game and basic equipment, the initial party starting out with it already equipped.
The Leather Cap is sold for 100 gil in Rabanastre and Nalbina Fortress, and is initially equipped on Vaan and Reks.
The Leather Cap is the weakest light armor hat, giving minimal magick resist and 10 HP, and falls off in usefulness as soon as the player procures something else to wear on their head.
In the original version, every party member starts with the license for it, Light Armor 1. In the Zodiac versions, Machinist, Monk, Archer, and Shikari can equip it, and Vaan starts with the license for it so he can wear it no matter the job, and does since he starts with it. There is no need to ever equip it on anyone but Vaan when he starts with it, as any party member who joins after him already has something better.