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 - Oxford Grey17.528
Adult Medium - Oxford Grey19.528.5
Adult Large - Oxford Grey2228.5
Adult XL - Oxford Grey23.531
Adult 2XL - Oxford Grey2432