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 - Black19.528
Adult Large - Black2129
Adult XL - Black2330
Adult 2XL - Black25.531
Adult 3XL - Black2733