We do not disagree - but as I wrote - if you own (or has access to one) a tiara and want to wear it (and dare) going to the post office then you are entitled to do so! You can wear it at home when you clean as well - you do not have to wait to be invited somewhere where it says white tie on the invitation for you to wear a tiara
And btw - even if you own a tiara and you are invited somewhere and it says 'tiara can/may be worn' in the invitation no one can force you to wear your tiara either if you do not want to can you imagine the headline 'woman sentenced to jail for not wearing her tiara' it would be as absurd as 'woman sentenced to jail for wearing her tiara to the post office'