Never, ever, ever under any circumstances whatsoever lead or participate in a worship service while wearing a baseball cap.
Not for a bad hair day.
Not if it’s “super casual.” No occasion for worship is ever THAT casual.
If you need to cover your head for religious or bad hair day reasons, choose another kind of cap or hat that is not a sports-oriented headgear equated with leisure and fun time, and is also, when not removed, a symbol of flagrant disrespect.
Also, and I know this because I recently attended a service where a minister actually wore a baseball cap the entire time — no one can see your face when it’s covered by the bill of a baseball cap.
So, it’s disrespectful, it’s sloppy, and it interferes with your ability to connect with the congregation.