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)
Girls Small (6/7) - Bright Yellow1218.5
Girls Medium (8-10) - Bright Yellow1320
Girls Large (12-14) - Bright Yellow14.523
Girls XL (16) - Bright Yellow1624.5
Girls 4 - Bright Yellow11.518.5
Girls 5-6 - Bright Yellow1219
Girls 6X - Bright Yellow12.520