What your music group chooses to wear on stage is part of how you present yourself to the world - but care must be taken not to have it become a barrier that might lead to exclusion.
A group's performance wear - their 'uniform' - is the first thing an audience will see, which is why many groups choose to specify what their members wear while performing. This can be a good thing; uniform can bring a sense of belonging to people and help them feel part of a team. If you’re trying to present a unified sound, it can also be effective if you look uniform too.