All the posts lately about being busty have reminded me of something I realized AFTER my wedding that I wish I would have thought of BEFORE I ordered my dress... even if you're not "tall", if you have a long torso, it might be worth it to see if there is a tall option. I know some designers simply add a couple of inches of fabric to the bottom which wouldn't help, but if they actually scale the dress up a little it could make a huge difference.
Why does being busty remind me of this? I received a lot of comments about looking like I was going to fall out of my dress, but I can assure you, I was cinched into it so tightly nothing even jiggled. After getting my pictures back and thinking about how the dress fit, I realized the problem was that my torso was too long for the dress. Even though I'm almost 5'8", I only have a 28" inseam - I'm all torso. When my dress hit me where it should in the waist, it just barely covered enough to make me decent up top.