Julia Roberts wore a black vintage Valentino that was such a classic the dress could be considered timeless. Her hair was worn up with a modified chignon in the back. The white satin straps of her gown replaced any jewelry she might have worn, in a lovely statement that less is always more. Juliette Binoche gave a 1920s feel with her Jean-Paul Gaultier corset dress, marcel waves, and long strands of pearls. Glamour is in, gowns are brightly colored and make a statement.
Hair is smooth and sleek.
And jewelry should only be used if absolutely necessary. If you want your fingernails to look especially nice, you can have extensions put on, get a french manicure, or just have a professional manicure done. You can go to a Salon that offers this service. Get an appointment and be sure that you communicate what you want to look like. Don't be afraid to tell them to do it again if they mess up some part of your look.