Well, in many all inclusive hotels there's a dress code with no bare chests/vests and no swimsuits for dinner. Maybe a rule like this would work on flights?But there has been a change, that’s undeniable. When I first started flying, people were properly dressed. I can guarantee on my flight next week there will be flip flops, women wearing bandeau type strapless dresses, men in sleeveless vests. On a flight last year I stood behind a girl (a mother actually, carrying her baby) wearing a T shirt mini dress with literally nothing underneath it.
I don’t think it’s snobbish not to want to be rubbing arms with someone else’s naked flesh.
When flights were more expensive the flight was a special occasion in itself, with behaviour codes to match.