I would expect that a gospel performance would require a suit or something close. Admittedly, I don't know much about the scene, but for me church always = dressed nicely.
Rarely from the musicians. A suit sould be overdressed, especially for all the moving around, setup/breakdown, etc. And for a lot of the contemporary/urban gospel gigs the artists themselves wear jeans.
Suits are standard for Sunday. Background singers/choir are expected to own black, grey, and khaki slacks, and jeans. Musicians usually just jeans or all black.
And to the other poster, on my days off I fix/repair/build things, particularly at my church. Jeans and a t-shirt.