This Jenny Yoo "Spencer" dress in dark ivory is a size 4. I am 5'6" 125 pounds (bust size 34C) and the dress was hemmed at the bottom (I wore 3.5" heels with the dress and it skimmed the ground). The dress has had cups added and some boning in the bodice for structure. The dress also had buttons added along the back along the zipper (see photos). The dress was purchased on September 23rd 2018 (receipt available upon request), arrived in January of 2019, was altered in February of 2019, was worn one time on March 10th, 2019, and was taken the cleaners for professional dry cleaning on March 11th 2019. It has been in the professional storage bag since being brought home from the cleaners. It is currently being kept in a smoke free home, hanging in the professional storage bag. The professional cleaners did a wonderful job cleaning the dress, and the dress hardly looks worn. There is one spot along the waist line at the back (next to the buttons/zipper) where the fabric pulled away and was repaired by the cleaners that is not noticeable, but not perfect (please see pictures). The dress includes a sheer fabric covering the deep V neck in front (hard to see in photos) that makes the dress incredibly comfortable to wear because you don't have to worry about anything popping out. One other note about sizing - according to the Jenny Yoo size chart I was a recommended size 4 in the bust (34 inches) and the waist (27 inches) but a recommended size 8-10 in the bottom (39.5 inches). However, given the shape of the dress, I ordered the 4 and it fit great. So, this is a great dress for ladies who have small waists but larger hips/thighs. It also swings beautifully while dancing, and is a lot of fun to wear!
Some additional information for sizing reference (though I cannot guarantee how this wedding dress will fit you): I wear a size 2 in Lilly Pulitzer dresses, a size 2 or 4 in Rebecca Taylor dresses, a size 4 in Kate Spade dresses, a size S or 2 in Joie, a size 4 in Tanya Taylor.