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 1727
Adult Medium 1929.5
Adult Large 2131
Adult XL 2432
Adult 2XL 2532.5
Adult 3XL 2834