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 Grey18.527.5
Adult Medium - Oxford Grey20.528
Adult Large - Oxford Grey2229
Adult XL - Oxford Grey23.530
Adult 2XL - Oxford Grey25.532
Adult 3XL - Oxford Grey2832