To me, there’s two inherent parts to your question.

One, is it OK to “dress down” at UIL.

Two, is your choice of dressing down appropriate.

I would say to be honest, it depends on what you’re asking your students to wear. If your students are in concert black, tuxes, or uniforms, you need to be at least at their level or one step higher. That means suit and tie if not concert black or tux on your own.

If your kids are showing up wearing a dress shirt and bowtie/concert dress, which is common at some middle school programs, you should again be one step above, and at least wearing a jacket. Band t-shirts? Probably get away with a shirt and tie.

However, in my old man opinion, you should show the judges that you are taking the event and the evaluation seriously. Dress professionally, dress appropriately for the event, and wear a suit and tie.

Of course, I am old-school enough to believe that band directors should still be wearing a suit and tie to marching band contest as well. Younger people disagree. But remember, younger people aren’t judging you. Older generation X directors/younger Boomers and retired directors are.