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 16.5026.50
Adult Medium - Silver1829
Adult Large - Silver2129
Adult XL - Silver2229.75
Adult 2XL 2330.50
Adult 3XL 2532