We don't require any particular clothing for our students beyond "reasonable for the event" Our crew does pretty good at figuring that out. If there is a specific dress code for an event, that gets communicated ahead of time. Generally though, I like to see my crews at
FOH dressed at least as well as the audience, and as dark as possible.
Personally, I wear black all the time. I have black jeans, black T-shirts, black Polos and black dress clothes/suit. And yes, I change after the show, before
strike. It only takes a few minutes, and beats tearing up an expensive pair of pants. I know it's been a long day when I take home enough dirty laundry to require two loads in the washer.