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 - Red 17.527.5
Adult Medium - Red 19.528.5
Adult Large - Red 21.529.5
Adult XL - Red 23.531
Adult 2XL - Red 25.531.5
Adult 3XL - Red 2732.5
Adult Medium - Red
Adult 2XL - Red 25.531
Adult 3XL - Red