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 Green1827.5
Adult Medium - Military Green2028
Adult Large - Military Green21.529
Adult XL - Military Green2430
Adult 2XL - Military Green2631