Adult model is 5' 5" with a 32B bust and a 27.5" underbust | measures a PA | pictured in PA
Youth model is 4' 11" with a 27" bust and a 25" underbust | measures a YL | pictured in YL
For a perfect fit, use under bust measurement. This bra is meant to fit snug but allows breathability. It is constructed in our Airbrush fabric for ultimate stretch with a soft pebble texture to conceal.