This dress is a Galina Signature, it was available exclusively at David's Bridal.
The description from their website: You'll feel utterly captivating in this dramatic, plunging-neckline wedding gown. The scallop-edged beaded lace bodice leads to a fit-and-flare trumpet skirt, edged in layers of tulle ruffles. The low, button-detailed back provides a flawless finish.
This was my niece's dress.  She added the rhinestone belt (it is missing a rhinestone-see pictures), but it can be easily removed.  She also had the bust area sewn up some to be more modest.  This dress is much prettier in person!  Also included is the veil she wore.  It is attached to a comb clip.