Flying is very stressful even the whole security check once you start flying more you get a system in place. For me it breaks down to slides, black socks, joggers or jeans with a zipper with a back pocket that can lock. I keep my phone in my right pocket with the boarding info up soon as it unlock. I have a spare wallet that I keep any important papers I get for example the baggage claim bag if I lose the wallet I’m good. A comfortable shirt. I also have sunglasses because the sun hurts my eyes a bit. I keep my carry on light with snacks, portable chargers, aux cords, and a book.