Go back 20-30 years and people would still wear their Sunday best, flying was something special - unruly children were either forced to behave or more likely were not from families who were financially able to fund the ticket price.
What did "Sunday Best" mean, in Y, C, F or R?
White tie, tailcoat and top hat would be best, but too much even for R (anyway, they are not to be worn by day). What is the proper level of dress?
Also, what should children wear on planes? Civilian suits, school dress uniform, or school undress uniform?