Monster Vest

The Monster Vest is the 22nd body armor in the game. It was called simply Zombie and was part of the Bio Hazard (Bundle) before it got a remake during the October Halloween 2014 update where it got renamed and part of the Monster Gear

Before Halloween 2014 It was unlocked at level 27 and provided 5% health. The description said "An undead radioactive body... Sounds great!"

During Halloween 2014 it got an update, now it provides 5% health and it got a special ability which decreases 40% the damage of Warlock tagged weapons in this case the Haunted Guns or the Darkness Combo Guns, also it has no level requirement anymore and it can be achieved by beating various tiers in the Monster Mash. The description got changed as well.

Appearance
A desaturated blue vest with green sleeves. A utility belt hangs from the left shoulder, and armbands  embroidered with a red-and-black skull decorate the wearer's arms. An axe protrudes from the user's upper back. The user's lower arms and hands are now mottled and have a cyan hue. Part of the vest is also torn.

Trivia

 * It was a part of the Bio Hazard bundle.
 * Bio Hazard (the elite enemy who wields the Blunderbuss) wears this along with the rest of the Bio Hazard/Monster Gear Equipment.
 * This body might be referred to Call of Duty: Zombies.