Montgomery Ward sanforized shrunk flannel pyjama shirt, c. 1930's.
Tag size 14.
 
Measurements
Shoulders: 15 3/4" - 40cm
Pit to pit: 19 3/4" - 50cm
Centre back length: 23 1/2" - 60cm
 
* Very faint reddish staining near armpits and on the back of the sleeve, but not noticeable when wearing.