I have always thought monk cloth robes and sandals would be a humble approach.
I used to attend a semi mega-church occasionally but realised most the “best dressed” were social show-offs. The preacher was a dandy. Those decked out didn’t fall out when tapped on the forehead much.
Many on this thread haven’t watched the video. It’s not about dressing too sportily, but rather about dressing trashily, with tight, sexy, revealing clothing or lack of enough clothing in church.