When laying flat, armpit to armpit measures 25.5 inches. 

When laying flat, shoulder seam to shoulder seam measures 17 inches. 

Shoulder seam to the bottom of the arm sleeve measures 24 inches.   

The measurement from the back/middle collar seam to hem of shirt (length) is 31.5 inches. 

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

Thanks for looking!