When laying flat, armpit to armpit measures 24.5 inches. 

When laying flat, shoulder seam to the bottom of the arm sleeve measures 9.5 inches. 

When laying flat, shoulder seam to shoulder seam measures 21 inches. 

The measurement from the back collar seam to the bottom of the shirt measures 28 inches. 

This shirt is in great condition and comes from a smoke-free home. 

Thanks for looking!