I've been wanting to order this since last year
I went by others that reviewed this dress. I am small sometimes and medium other times, so I went with the medium because other girls that were 34C bust and 5'7" also got medium. It is a bit big in the chest, so it would be good for someone who is a 34D. It's very cute, and it's right at my knees, which is what I was looking for.