Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Adult Small - Military Green17.527
Adult Medium - Military Green20.528.5
Adult Large - Military Green2229.5
Adult XL - Military Green2230.5
Adult 2XL - Military Green2530
Adult Medium - Military Green2028