1:Measure your waist ,bust ,hips size and compare with our own size chart.(for mermaid and zipper back style,these three sizes are all important).
2:If these three sizes does not belong to one standard size, choose the bigger one.
3: After all no one's figure is standard size, you can find a tailor make a minor alteration on the place that doesn't fit.
4:If you are not sure which size should choose, please contact us via amazon,we will offer you the best suggestion.