[1] For a theatrical performance, cast members wear their costumes.
Scripts are unusual for actors, while the stage manager and director usually continue using scripts even during dress rehearsal and actual performances.
For a musical performance, the dress rehearsal does not always require wearing formal concert outfits (such as tuxedos and gowns).
For a dance performance, the dress rehearsal is the final rehearsal of a live show shortly before the show.
It is a rehearsal conducted as if it were a live performance to ensure perfection for the actual show.