I rented this dress for a family wedding and opted for the 4 since the 6 was out of stock for the date that I needed it. I typically wear a size 4/S but sometimes need to size up for various reasons. The dress was adorable but very tight in the waist, making it uncomfortable to wear while sitting down. The length was great and the dress is a wonderful option for a fall wedding, however I would recommend sizing up if you're considering renting this dress.
I wore this dress to a rehearsal dinner and it was great! I tried on the 4 and 6 in the showroom. The 4 was tight in the shoulders with the straps. It was a little more snug than I wanted on the rest of the dress so I sized up for comfort. The 6 worked perfectly.