Oh so what, who cares? Now for me, I don’t fly spirit and I try to get first class for flights longer than 3 hours if I can, so I do tend to wear like what you could maybe call “elegant casual”. (I don’t wear jeans— very rarely— I’m in my 50s).
On my flight at the end of the month (cattle car economy), I’m wearing black stretchy pants and a black tunic. Chic. I always wear closed toe shoes for safety, good measure and just in case.
I can’t believe some people wear high heels, flip flops, sliders and whatever else. If I need to run, I want to be able to run.
my 2 cents, worth exactly that.
ETA: I tend to swell up like a balloon when I travel, so elastic is necessary.