Military Master Sergeant rank shirt.
The item id for Military Top Grassland Master in unturned is 3509. 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: 6
Height: 3
Armor: 0.9
Blueprints: 2
Blueprint_0_Type: Apparel
Blueprint_0_Supply_0_ID: 3509
Blueprint_0_Product: 66
Blueprint_0_Products: 3
Blueprint_0_Build: 32
Blueprint_1_Type: Repair
Blueprint_1_Supplies: 1
Blueprint_1_Supply_0_ID: 66
Blueprint_1_Supply_0_Amount: 3
Blueprint_1_Build: 32