Lying flat down approx. size measurements:
Medium
Shoulder(seam line to seam line): 18 inches
Armpit to armpit(across chest): 21.75 inches
Sleeve(shoulder seam line to end of sleeve): 25 inches
Back body center length(bottom of collar to hem): 27.75 inches
Large
Shoulder(seam line to seam line): 19 inches
Armpit to armpit(across chest): 23 inches
Sleeve(shoulder seam line to end of sleeve): 25.75 inches
Back body center length(bottom of collar to hem): 28.25 inches
XL
Shoulder(seam line to seam line): 20 inches
Armpit to armpit(across chest): 25.25 inches
Sleeve(shoulder seam line to end of sleeve): 26.25 inches
Back body center length(bottom of collar to hem): 28.75 inches
XXL
Shoulder(seam line to seam line): 20.5 inches
Armpit to armpit(across chest): 26 inches
Sleeve(shoulder seam line to end of sleeve): 27 inches
Back body center length(bottom of collar to hem): 29.75 inches