Size Chart ElleStyles
ElleStyles Brand Size Chart
The first chart is measurements of the dress (relax to stretched),not measurements of the wearer's body.This is just to give you an idea how large the dress is.
The second chart is the important one. Using your own measurements, you can determine which size you are most likely to be. Measurements are for around the fullest part of the bust, smallest part of the waist, and largest part around the hips. Go for the smallest size that your measurements fall under.