If you are wearing the evening gown, then such dream indicates joy, pleasurable situations and honor. On the other hand, the dream could show that you are trying to find the support. To get more detailed dream interpretation, please pay attention to the color of the gown.
Dream dictionary: Evening Gown dream meanings
…constant changes in one’s life, poverty, hunger, starvation, or death. The night and the day in a dream also represent wisdom and protocols, or indulging in something one will regret. The nightfall in a dream also may denote changing times, or changing trends. The night in a dream also could represent an African woman, while the day may represent a Caucasian woman, or a pregnant woman. The night in a dream also represents the evening gown, while the day represents work. The night in a dream also means veiling one’s difficulties and taking refuge in a safe place, except if the one seeing the dream is a traveller, then the night in his dream means injustice and ignorance. The night in a dream also denotes devotion, holding a night vigil, attaining one’s goal, or meeting with one’s beloveds. (Also see Darkness | Evening | Moon | Night of power)…