The Calot Hat is a low-ranked mystic headgear in Final Fantasy XII that boosts the wearer's Magick Resist by 10 and Magick Power by 3, and in the Zodiac versions, MP by 25.
The Calot Hat is sold for 700 gil in Bhujerba after meeting Ba'Gamnan in the Lhusu Mines, on board Dreadnought Leviathan, Rabanastre after visiting the Leviathan, Dalmasca Westersand after the Leviathan but before obtaining the Treaty-Blade, and from Dyce outside the Tomb of Raithwall. It also rarely drops from the Ripe Rampager.
The Calot Hat is sold for 700 gil in Rabanastre and Bhujerba after meeting Ba'Gamnan in the Lhusu Mines, and on board Dreadnought Leviathan. It is found as a treasure in Phon Coast's Vaddu Strand (always appears as part of the treasure formation on the beach), as well as in the Trial Mode Stage 23 with the Diamond Armlet equipped. It still rarely drops from the Ripe Rampager.
The Calot Hat is a low ranked mystic hat, giving 10 Magick Resist and 3 Magick Power, as well as 25 MP in the Zodiac versions. Mystic armor offer magick-related bonuses that affect all types of magickal actions, from casting black magick to damage an enemy, to casting white magick to heal the party. Magick Power is also a factor when determining damage dealt by katana, staves, and maces.
In the Zodiac versions, White Mage, Red Battlemage, Black Mage, and Bushi can equip it, and so the Calot Hat is only useful to buy if the player has chosen any of these License Boards for their party's first jobs. The superior Wizard's Hat is available soon after the Calot Hat, and so the player may want to skip it in favor of it. The player could get it early from the Ripe Rampager, but it is arduous to spawn as it is Rare Game, and so it is likely not worth the effort to try at repeatedly for a low-ranked equipment piece like the Calot Hat.
Behind the scenes
The Calot Hat appears in the Vaddu Strand treasure formation in the Zodiac versions, whose placement and contents are unusual compared to other treasures in the game, including items like Teleport Stones and Braid Wool not normally found in treasures. This is a clue that this set of chests holds a secret. Taking the first Japanese character/syllable of each treasure going east to west produces portions of the Japanese names for Great Crystal, Pharos - First Ascent, and Skyferry, the locations of the three strongest invisible weapons and shield: Gendarme, Great Trango and Seitengrat, respectively. The hint is lost in the English localization.
A calot is a close-fitting cap without visor or brim.