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
Adult Medium - Military Green19.528
Adult Large - Military Green21.529
Adult XL - Military Green23.531
Adult 2XL - Black25.531
Adult 3XL - Military Green2732