This is a Maternity TFNC London dress from ASOS. You can find similar ones on ASOS website. I actually have two of these dresses - one size 12 and one size 10 (UK Sizes). They were for my sister and I. She wears a size 4 and I wear a size 6. Her dress has a bit of alteration at the chest so that it wouldn't fall open when she leaned over. Email if you are interested in both.
The dress is maternity style. It is really comfortable, and I didn't have to worry about my stomach growing by wedding time because of the cut of the bust. It was great! I am 5' 8'' and didn't wear heels. The dress went to the floor and could have even been hemmed up a bit, but I didn't. It is unaltered.
There is a little dirt on the hem, but you can barely see it.