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)
Junior Small - White Body Black Trim13.525
Junior Medium - White Body Black Trim14.525.5
Junior Large - White Body Black Trim1527
Junior XL - White Body Black Trim15.528