I ordered a 4L for my senior ball because my size (4R) was not available on the day of the event. I was really worried about the length, but the 4L was perfect with my 5in heels. The dress runs large, and the bodice was a bit loose on me. The fashion tape that RTR sent was really helpful in that aspect. However, train was difficult to deal with-I ended up holding it for most of the night for fear that it would get stepped on, so I would recommend the regular length for girls under 5'6". Overall, I couldn't have been happier with the RTR experience, and I can't wait to rent again!