Flak Jacket

A flak jacket is an item of protective clothing popular among ninja. Flak jackets have several pockets and pouches that can be used to store and quickly access weapons and other supplies. When on missions, they provide at least partial protection from damage by blunt-force trauma, shrapnel, other projectiles, and even blades. Flak jackets started being worn around the time of the First Shinobi World War, replacing the Shinobi Battle Armour common during the Warring States Period. They are worn by most ninja of chūnin rank or higher; the anime sometimes depicts genin wearing flak jackets.

Styles
Each hidden village has its own design or designs of flak jacket.

Trivia

 * During the Warring States Period, a member of the Hagoromo clan was seen wearing armour that closely resembled a flak jacket.