When I purchased the dress I was originally disappointed in the material and how the sizing was. I am 4' 11", 108 lbs and chest size 34 B and couldn't even fit into the size small. Had I purchased a size medium I more than likely would have fit in it. The back did not zip up at all due to it being extremely small and the material has absolutely not stretch to it.I would say it fit like an XS or XXS. I did how ever love the pattern and style so I was determined to wear it. I had a cute long, sleeveless cardigan that would cover the back where it wasn't sized and I rocked that dress for my bridesmaids brunch I threw with all my girls. Lots of compliments on the style of dress and pattern.So if you buy this dress buy a size up and if you are busty 2 sizes up.