Vintage circa 1940s gent's CC41 issue shirt.
 
Striped cotton, the label is marked Banner Regd. British Make.
 
Banded collar. The top button will require a stud to fasten it (not provided).   Expansion gussets at the sides and at the sleeve placket. Lined with cotton muslin inside the upper front and back.
 
Some rust type marks at the lower front inside and out. A few minor spots here and there, small fray nip at the hem. See photos.  A few mismatched buttons.  Minor general wear. 
Laundered. 
 
Seam to seam across the shoulders at the back is 18"
Sleeves are 23 1/4" from shoulder to end of the cuff
From nape to hem is 36" 
Across the chest under the arms is 21 1/2" -  pit to pit, flat, across the front
Collar is 13 3/4" when fastened.