FINAL SALE AND SOLD AS IS 
The bust is measured from underarm seam to underarm seam across the front, double to get the circumferece.  The length is measured from shoulder seam to the hem.
Small: bust is 18" (36" around), length is 25"
Medium: bust is 19" (38" around), length is 25"
Large: bust is 20"  (40" around), length is 26"
X-Large: bust is 21" (42" around), length is 27"