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 - White
Adult Medium - White
Adult Large - White
Adult XL - White
Adult 2XL - White
Adult 3XL - White