MASH Co WWII US Navy M-43 Chambray Shirt. This is a an amazing recreation of the classic chambray work shirt. When I got my sample from MASH, I was blown away at the attention to details. They come in the following sizes: 14 (small), 15 (medium), 16 (large) & 17 (extra large).
From their website:
We're glad to announce here for the completion of our "US NAVY M-43 Chambray Shirts". We have reproduced "US NAVY M-43 Chambray Shirts" authentically with the correct pattern, sewing style, classic Indigo chambray fabric in same specs as WWII.