The US outfit from the WW2 (World War Two) is constituted with a mustard set, over which we can add specific jackets and trousers to each division.
So the M37 shirt, also called mustard shirt (due to the color) is the base of any US ouftif. Heritage-Airsoft proposes you a troop shirt, differentiated from the Officer shirt by the absence of the shoulder boards, allowing to set ranks.
The shirt, manufactured by the reference Sturm Mil-Tec, include 2 chest pockets, these can carry your ID cards (real or fictitious) and also, why not, some (Ari)dollars or old Francs.
Its also the shirt worn by 2nd French Armored Division of the General Leclerc. Except French have chosen to wear the tie even if its the combat outfit, unlike US, which worn it only with the Service Uniform, the mustard shirt being, one more time, the base over which you can add your Ike Jacket or your Service Coat (4 pockets)
Whatever you want to do some Rangers from Saving Private Ryan, or US Paratrooper with Band of Brothers, or even a Service uniform like Flag of Our Fathers, the shirt, constituted with 20% of wool and 80% of polyester, is a must for US WW2.
Good to know: the tie is not included with the shirt.
Its easy to wash it in a classic washer.