WW2 U.S. blouse / shirt No.8

Don’t know exactly what to call it, but I believe that it was officially called a shirt.
This shirt is in perfect mint condition in very nice size.
The front is closed with 7 buttons and the 2 breast pockets are both closed with one button each.

Markings:
Shirt is labelled and it reads “Shirt, Flannel, OD, coat style”.
On the label the shirt is dated jan-1-1945.
See pictures

Condition: mint / have to be ironed