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 - Royal Blue 1827
Adult Medium - Royal Blue 2028
Adult Large - Royal Blue 21.529.5
Adult XL - Royal Blue 23.530
Adult 2XL - Royal Blue 24.531