Well Whirly,
Obviously these guys are not the suave and debonair aviators we are. Metamorphosis dressing is not for the faint hearted and it is a liittle too much for the 20 year old boxfresh CPL to pick up overnight. I myself regularly pack a dinner suit under the flying suit. Gieves and Hawkes provide all of the tools for transformation dressing, packed into a small overnight bag.
Your comments are very valid but remeber they have been told what to wear (probably by someone who did not realise how the instruction would be interpreted).