Everything about the dresses should be compatible so the lady would look elegant and unique on her night party. Because all the eyes would be on the girl when she makes some of her public outings within the party such as in Chambelan and in her speech she has to select the type of black long sleeve dress that would make her attractive, elegant and beautiful. At least she has to put on that type of black long sleeve dress that would make her appear different from others. There should be something in her that should set her apart from the rest in the crowd. 
Black long sleeve dress should not mean that the dress should be a chunk. One should search for high quality dresses that would make the lady important and elevated in status. It is possible for one to get high quality black long sleeve dress. The place where one can get that type of dresses is in the internet. There could be website especially those that deal on party that are willing to offer their products at reduced prices. All that one needs to do is to search hard for it.
Different kind of Black long sleeve dress, different in style. Which one would you like?