Don't Float in the Gap

Pretty gown, popular style with the ruched bodice, sweetheart neckline. But for a lot of girls this could be a problem gown to wear. Reason is the low back.
We've all seen them, the girls who are constantly pulling up their strapless gowns. Or worse yet the gap! You know the one, the one where we're deathly afraid something is going to fall out! Well if the back of your gown is lower in the back than in proportion to the front, it has nothing to pull against to get a tight fit. So if you're small busted and can't push out the front of the dress you're going to have problems with the gown fitting properly.
Here's one that's really low in the back!
If you are still opting for a low back gown make sure it has the boning in the bodice. Look for a specialized long-line bra. You may even need to wear a Nubra underneath the long-line to fill it out/push it out further in order to fill the dress. Don't have bra cups sewn into the dress! Sewn in bra cups follow the dress not you.