Chances are, when you come to the hall, the performers will be in formal attire (unless you are attending a rehearsal). As an audience member, however, tails, top hats, evening gowns, etc., are all optional. Many concert goers will tend to dress up a bit, but they’d probably say that they’re most comfortable attending a concert that way. So, don whatever you think would make you comfortable in the setting of a concert hall; a good guide might be your personal dress code for work or dinner with friends.
Posted in: concert etiquette