Layer on a top: This will give you a shot of texture and can add coverage to a more bare dress. Choose one in a silky fabric to keep the overall effect dressy.
Belt it: It's such a quick and easy way to play up your waist. Have some fun by picking a belt with embellishment.
Put a long slip underneath: This lends a really flattering petticoat-style kick at the hem. Go for one in a bold hue or with a lace trim.