RE: Sunday best on flights
Yes, I remember.
I still do it, mainly because an airline lost (aka stole) my luggage on a business trip once, and I had only dressed in nice casual clothes. They never did find the missing luggage. Fortunately, the long-time client was understanding about my work attire that time.

At one time, flying was a treat that everyone dressed up for.
Airlines once hired only attractive women to work as stewardesses, too.

this country could use a little more public shaming in a variety of area's rather than law suits or prison. Embarrassment is something today's crop of dipshits have little to none of and its a really good preventive personal regulator of personal conduct.

my 2 bits

And that’s a good example of what slutsplaining looks like.

In this corner—wearing only yoga pants and a halter top—we have Entitled Millennial!

Annnd... in this corner—wearing a frown and clutching her pearls—we have Feminist Scold!

Let the fight begin!

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If they really wanted the young woman to stop, they should have had male members of the cleaning staff take pictures of each other standing behind her and ask her for her phone number until she learned to behave herself properly in public.

It's up to the airline, but I think she should be able to fly her freak flag and dress however she wants.