The bust is measured from underarm seam to underarm seam across the front.  Double to get the circumference.  The length is measured from the shouldler seam straight down to the hem in the center in the front and back.   A size 1 is a size small/medium; a size 2 is a large/xl.
1: Bust is  24" (48" around).  Front Length 27"; Back length is 30"
2:  Bu