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 Grey Body Black Trim1827
Adult Medium - Oxford Grey Body Black Trim19.528
Adult Large - Oxford Grey Body Black Trim2230
Adult XL - Oxford Grey Body Black Trim2430.5