A dress rehearsal is the last rehearsal before the performance. It is called a 'dress rehearsal' because in a theatre the actors will be wearing their costumes. When an orchestra or other music group have a 'dress rehearsal' this does not mean that they have to dress up. It simply means that it is the last rehearsal, and it will be in the hall where they are going to perform so that everything is as it will be for the performance.
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