Are usually wear a medium but based on the reviews I ordered the small and it fit perfectly.  I cant say enough about how lovely I looked in this dress on the Vegas strip. I received many complements as I walked down the strip with my hubby from men and women.  I am bottom heavy ...measurements approximately 34A, 29 waistline, 41 hips, ~133 lbs.  I will be ordering this dress in more colors because It is an amazing cut and fits my frame magnificently.  The length is about 3 to 4 inches above the knee so not too short for a mom of 2. Very flattering this dress is for my figure.