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 - Black1625
Adult Medium - Black1826
Adult Large - Black19.528
Adult XL - Black2329
Adult 2XL - Black23.529.5