If it is a dancing costume, then it indicates that to be successful with our partner we must be honest. If you dance with your loved one, then it indicates a strong connection between you two. If we fall while dancing, then such dream warns us that we are not as arrogant as we should be. If the dream is unpleasant, then it denotes to fear about our relationship.
Read more about dreaming of Waltz in other dream meanings interpretations.