If you are going to wear a dress with plunging neckline, I’m sure you don’t want people to see your undergarment or you bare breast. You can easily secure that area with double faced tape that you can get at the drug store will do, you don’t have to buy the one specially used for garment as it is very expensive.

After you’ve done so, you don’t have to worry about the peek-a-boo incident and enjoy your wedding.