While shorter, flirty dresses are super popular, floor-length gowns are still the favorite when it comes to ultra formal weddings. How do you pull it off? “For a very formal dress, you want something more neutral and not overly bright,” says Sanders. Since a long column dress in bright fuchsia may be too overwhelming or attention grabbing, try a dress in a gray or graphite color instead. This particular dress is a great pick for girls who are a little smaller up top, since the crisscross detail adds volume to their chest area.

Get it: Silk Chiffon Dress in Graphite, $365