This is a brand new Mori Lee gown. I call this Diamonds and Pearls. It is absolutely gorgeous! Never worn, brand new, has all tags and covers on the dress. I tried this dress on in the store and ordered it. By the time it came some things in life had changed and we no longer need this dress. This specific dress has never been off it's hanger.
The back is a lace-up style. I did my best to take a photo without removing the full gown from the dress bag.
Edit to add: I uploaded a front and back view of this dress using stock images online. If you google search Mori Lee 5216, you'll see many stock images and others who purchased this style dress so you can better see how it looks :)