I've worked in alot of spaces where even the board ops, SM, or anyone else in the booth is still visible to the audience. Even in a standard,
unidirectional proscenium during
intermission or preshow an audience member may still turn around, or look up on the way out of the
house, and see the booth crew. For this reason, I ask all of my techs to be in black. The only possible exception is non-theatre students taking Stagecraft or
Intro to
Theatre who need to be in a show for class, if they are board ops and don't have black pants, they can wear jeans. If you need to be in
house, or seen by the audience directly, wear nicer blacks. If I am running a show in
house, or from a setup in a non-theatre space, I generally wear nice black pants and a black dress shirt - or working for the University sometimes my formal "University Tech Crew" polo, which is also black.
If I need to go fix something in
house, or run a show from in
house, I would rather look like a well-dressed professional tech than some random audience member fiddling with equipment.
Clark