I Wonder Why This Number Is Rising So...
Politics1 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.A hat is designed as head-protection...from sun, rain etc. Clearly, it is unnecessary indoors. Apart from that, removing your hat is simply a mark of respect. That's why men used to raise their hats to passing ladies or young men would raise their hats to older men. In the case of a uniform hat, the wearer - eg a policeman - is acknowledging by removing it that the house, office or whatever he has just entered is someone else's domain, not his.
In olden days, a knight's removal of his helmet would have been a signal that he was happy for his face to be seen and identified. It would also show that he was disarming himself by exposing his head to possible attack. Both of these were gestures of friendship.
So many young men nowadays wear permamently-affixed baseball-caps, I'm astonished to hear you were asked to remove your hat in a pub. Thank goodness some people still keep up the old standards. (Women's hats have always been treated differently...maybe because they were never knights!)