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 18.5028
Adult Large 2128.50
Adult XL 22.7530.25
Adult 2XL 24.5032
Adult 3XL 2931.50