Lying flat down approx. size measurements:Small
Armpit to armpit(across chest): 20.5 inches
Back body center length(bottom of collar to hem): 25.75 inches
Medium
Armpit to armpit(across chest): 22 inches
Back body center length(bottom of collar to hem): 26 inches
Large
Armpit to armpit(across chest): 23.5 inches
Back body center length(bottom of collar to hem): 26.5 inches
XL
Armpit to armpit(across chest): 25 inches
Back body center length(bottom of collar to hem): 27.5 inches