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 Medium - Royal Blue2127
Adult Large - Royal Blue2327
Adult XL - Royal Blue2529
Adult 2XL - Royal Blue2730