Old shabby knight's pants.
The item id for IR Knight Pants 1 in unturned is 15013. 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: 2
Size_Y: 2
Size_Z: 0.65
Width: 6
Height: 3
Armor: 0.95
Blueprints: 2
Blueprint_0_Type: Apparel
Blueprint_0_Supply_0_ID: 15013
Blueprint_0_Product: 66
Blueprint_0_Products: 2
Blueprint_0_Build: 32
Blueprint_1_Type: Repair
Blueprint_1_Supplies: 1
Blueprint_1_Supply_0_ID: 66
Blueprint_1_Supply_0_Amount: 2
Blueprint_1_Build: 32