Why should one dress nice to fly?
Now days I am happy if they are just dressed. I've seen fat chicks get one with an outfit that belonged on a Brazilian beach. Or wearing white leggings with no underwear that you could literally see pubic hair sticking out the front.
And if you fly China Eastern air, you never know what you will see on that airline. Twice on different flights I have seen (different) men actually strip down to their boxers in the aisle, walk into the bathroom to shave and bath at the sink, come back and put on different clothes. Saw one dude piercing his nipple himself. One lady was giving all three of her kids haircuts, and I don't mean little trims either. I mean she was hacking that shit off like they were entering the witness protection program fugitive style.
Airplanes bring out the worst in some people.