I rarely buy ready to wear dresses, so I had to order this 20 W because the 18 W was too tight around my middle. My problem is that my bust measurement is on the chart at an 18 W but my waist is just a bit over the chart for the 20 W. So their sizing chart is accurate, the one with the pictures of the dress.
I was impressed by the quality and construction of this dress. Higher quality than I expected at this price.