There is no size tag; please see the measurements below. There are some faded areas on the front. Please see the photos. 
When laying flat, armpit to armpit measures 26.5 inches. 
When laying flat, shoulder seam to the bottom of the arm-sleeve measures 21 inches. 
When flat, shoulder seam to shoulder seam measures 22 inches. 
When laying flat, armpit to the bottom of the shirt measures 15 inches. 
The measurement from the back/middle collar to the bottom of the shirt is 27 inches. 
This shirt is in great vintage condition and comes from a smoke-free home.  
Thanks for looking!
A835