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 - White Body Royal Blue Trim17.527.5
Adult Medium - White Body Royal Blue Trim2029.5
Adult Large - White Body Royal Blue Trim21.532
Adult XL - White Body Royal Blue Trim23.531
Adult 2XL - White Body Royal Blue Trim25.533