Wearing a PC in the Daytime??

[Jock Scot]

White tie, black tie, formal, informal I was always told and I have followed that advice for 60 odd years, that it was a guest's duty to discreetly find out what the dress requirements are for a particular event, if one was unsure.I was also always told that if a particular situation was really in doubt under dressing was far better than the alternative. Further more, I was also told that if one could not beg, borrow, hire or buy(in my time I have done all of these) the correct attire one should politely decline the invitation. None of this is rocket science. Is it?