I was very sad that this didn't fit. I got a size 16 and could barely get it zipped. However...... if they had a size 18 available I would have gotten another one. I sent mine back with a sadden heart because I truly loved this dress. The length was perfect. I would have had to wear a small  heel and that was exactly what I was looking for. I'm 5'11 and about 240lbs with a Double D cup. a 16 is normally what I wear but there is no give to this fabric.