Trusty overalls for driving trains.
The item id for Engineer Bottom in unturned is 408. 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: 4
Height: 3
Armor: 0.95
Blueprints: 2
Blueprint_0_Type: Apparel
Blueprint_0_Supply_0_ID: 408
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