What dress is nice at night time ?

It depends on the occasion. If it is to go out to dinner then you can never go wrong with a black dress. One that isn't too revealing or too short. If it's for a party or some type of club scene, mybe a short dress (color not too important). When going out clubbing more skin may be shown. for example the length of the dress and a halter or a tube (strappless) dress are appropriate.