I purchased sizes AU6 and AU8 (US 4 and 6) as I wouldn’t know which fit I would prefer. My true size is a US6 but I chose the AU6 (size us 4) for a tighter fit. Sizing down definitely accentuated all my curves while having a bit of room to give also. It was a struggle to pull it at the hips but we got through! Lol you will not regret getting this dress! I was a bit worried that the midi dress would look longer on me as I’m only 5feet but it was a beautiful midi length on me! I did want to mention the slit in the back is pretty high, it cuts a little underneath the cheeks as shown in my photo. Material is not cheaply thin either!
Overall, if you want it to fit like the model in the photo size down, if you want more of a “slip dress” relaxed fit stay true to size.
For reference my stats are 35inch bust, 28inch waist, 39inch glutes