Here's the scenario. My sister is getting married at 11:00 AM. The ceremony will be outdoors or in an old house converted to a museum (same locale) My brother (bass trombone) and I are playing for her ceremony. What should we wear? I own a tux, my brother does not (an inverse correlation with playing ability

I don't know what position we will be perfoming from relative to the ceremony. My brother was figuring if we are up front, than fancier, if in the back less fancy.
Thanks for your help!
Philip "I'd better get crackin' on the wedding music" Jensen