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 - Cedar Red1827.5
Adult Medium - Cedar Red2029
Adult Large - Cedar Red21.529.5
Adult XL - Cedar Red2430.5
Adult 2XL - Cedar Red2631