Just received this dress today and I am pleasantly surprised!  I am a true size 14, very curvy, and the Large fit great.  I am 53 and the dress is just a tad too long if I am wearing flats.  However, I gathered up one side of the hem and tied it in a knot a couple inches above my ankle, and it is perfect!  Nice, soft material.  If you are between sizes, I would go with the smaller size.