I have a very hourglass shaped body (actually maybe pear since my hips are so big) and went with the 10 to accommodate my hips, though it was definitely too big on top. The 8 fit better on top (maybe even could have worn a 6) but was too tight on bottom. There was a pretty big difference between the sizes in terms of fit and length (the 10 was significantly longer than the 8). Very cute dress though.