Flak Jacket

Flak jackets are usually worn by chūnin and jōnin over their normal clothing in most villages, although the design varies among the villages. Although they are called jackets, they look more like a vest, or other similar garments. The jackets are among the most iconic pieces of shinobi equipment. Most of them have pockets, which can be used to store scrolls and also allow a ninja to access them with only one hand, as seen with Kakashi's case when he normally does this secretly to extract a kunai. The jackets themselves act as added armour during battle for shinobi as well.

Trivia

 * In episode 190 of Naruto: Shippūden, Iwagakure genin are seen wearing flak jackets.
 * In episode 242 of Naruto: Shippūden, the flak jacket Ganryū wears is a standard Iwagakure flak jacket minus the slate grey color.
 * Certain shinobi are seen wearing different variations of their village flak jacket; specific variations include no shoulder padding, neck guard, or even pockets.