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 - Royal Blue19.524
Adult Medium - Royal Blue21.526.5
Adult Large - Royal Blue23.527
Adult XL - Royal Blue2627.5
Adult 2XL - Royal Blue2827.5