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 - Black 17.527.5
Adult Medium - Black 1928
Adult Large - Black 21.529.5
Adult XL - Black 2330.5
Adult 2XL - Black 25.531
Adult 3XL - Black 2732.5