Grab that "little black dress" from the back of the closet when that invitation to a formal dinner party arrives. Of course, your dress needs to be in the class of a cocktail dress. It can be short, meaning at the knee or slightly above, with a formal touch. This could mean a little sheen to the fabric or even a few touches of rhinestone accessories. Be sure to wear tasteful and color-blending shoes and evening style handbag.Wear a long formal dress to a formal dinner party that is of a more grand nature or maybe even a media involved event. Again, make sure your shoes and handbag are coordinated with your dress. Look great in formal evening pants. This never means denim of any type. Your formal evening pants should have some flow to them and be topped with an evening style top, camisole or jacket. Attend an evening formal dinner that is part of a wedding by wearing any of the dress attires listed above. Of course, if you are in the wedding party, you'll have to abide with what the bride and groom have selected for your formal dress attire.