Q. I very recently attended my son’s black-tie leavers’ ball at his school on one of the hottest evenings of the year. I thought it would be good opportunity to wear my white jacket and was very surprised to find that nearly everyone else was in the usual black DJ. I spoke to the one other man who was wearing a white jacket, observing that if you couldn’t wear it in mid-summer, when could you? He suggested that there was a formality about not wearing a white tux north of a certain latitude, but was not precise on this point. This sounded pompous nonsense to me, but do you have any views or rulings on this, Mary?
— J.M.S., Shipston-on-Stour
A. This debate is a little bit 20th-century. White dinner jackets were for going on cruises and abroad, whether to India or to China, or for pretending to be dodgy in Italy.
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