Hello, Everyone:
I usually wear a suit and often a tie when flying even if not on business. People tend to (unconsciously I think) give me a little more space and slack compared to when I'm wearing jeans. I also find a suit to be incredibly useful with all those extra pockets. Now, if they'd just occasionally make a mistake and seat me in first class! Sometimes, though, harried older people mistake me for somebody with the airline and ask for assistance or directions.
LOL! :-)
BTW, First Class is all I fly period. (I either upgrade or pay)