At least ban flip-flops. But I digress, I don’t fly anymore.
I used to look sharp in a jacket and Danner boots on my way to WY. (Had to go international terminal at dfw to JHx)
I don't wear flip-flops, but I would often wear sandals while flying because they're easy to take off and put back on when going through security. Thanks to Trump, we no longer have to do that anymore.
I also wear pants that can stay up without a belt, and I try to avoid anything with metal buttons or zippers.