You shouldn't have this.
The item id for Kuwait Outfit Boss in unturned is 5359. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Clothing
Size_X: 3
Size_Y: 2
Size_Z: 0.6
Width: 1
Height: 1
Armor: 1