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 - Navy Blue17.528
Adult Medium - Navy Blue19.528.5
Adult Large - Navy Blue2129
Adult XL - Navy Blue2330.5
Adult 2XL - Navy Blue2531