Lying flat down approx. size measurements:
Large
Shoulder(seam line to seam line): 20 inches
Armpit to armpit(across chest): 24.25 inches
Sleeve(shoulder seam line to end of sleeve): 25.5 inches
Back body center length(bottom of collar to hem): 26.5 inches
XL
Shoulder(seam line to seam line): 20.5 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): 28.5 inches
XXL
Shoulder(seam line to seam line): 22 inches
Armpit to armpit(across chest): 27.5 inches
Sleeve(shoulder seam line to end of sleeve): 27 inches
Back body center length(bottom of collar to hem): 30 inches
3XLT
Shoulder(seam line to seam line): 26.25 inches
Armpit to armpit(across chest): 31.5 inches
Sleeve(shoulder seam line to end of sleeve): 27.75 inches
Back body center length(bottom of collar to hem): 32.5 inches
4XB
Shoulder(seam line to seam line): 26.5 inches
Armpit to armpit(across chest): 32.75 inches
Sleeve(shoulder seam line to end of sleeve): 26 inches
Back body center length(bottom of collar to hem): 31.75 inches