Love showing off some decolletage?  Low necklines can be so flattering and in my opinion look good on most women, no matter how large or scarcely defined the bosom is.  Fit is key here so finding the right alterations specialist is important.  If you have your gown custom made the fit is built into the gown; gowns ordered through a salon go through alterations once delivered . . .

The Square Neckline-One of my personal favorites, conveying a real open look, square necks look great on ballgown and A-line silhouettes.

The Scoop Neckline-Lower and more open than the round neckline and if it's low enough can ow off some cleavage
  The V Neckline-Though wider cut and more open than most, this V points down and up like the letter it is named after.
 The Off-the-Shoulder and Portrait Neckline-
Both necklines are similar and extend horizontally across the collar area and either sit slightly above or below the shoulders.
All dresses by Amy-Jo Tatum