When I was singing, I always wore Sunday best, and that was a collection of conservative jacket dresses, hose, and dignified pumps.
When I played my recent wedding, I wore a dressy black velvet pants suit. It was an awful day, snow and Ice predicted and bitter cold.
I personally would never wear a gown unless it was at the express request of a bride. I would no doubt lose a foot n the folds and miss all my chromatids.