Harry, agree with some of what you say.
Do you have a reference as to why I can't fly in pyjamas? Also why we can't do paperwork in the climb above FL200? Again.. I personally don't, but when appropriate why not?
Apologies for the massive thread drift, but its amazing how one's choice of clothes in a locked room seems to affect your professionalism. One reason I love the freighter to be away from this kind of BS and wear a t-shirt for the whole flight.