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 Blue1726.5
Adult Medium - Navy Blue1926
Adult Large - Navy Blue20.528
Adult XL - Navy Blue23.528.5
Adult 2XL - Navy Blue2529