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 Blue17.527
Adult Small - Royal Blue17.526.5
Adult Medium - Navy Blue2028
Adult Medium - Royal Blue1928.5
Adult Large - Navy Blue20.529
Adult Large - Royal Blue22.529.5
Adult XL - Royal Blue2330
Adult 2XL - Royal Blue2432