But, for a girl, is it inappropriate to wear a beret in the classroom for example?
- Totally inappropriate
I'm indifferent about if people wearing hats indoor is impolite or not. I think it's up to the person who own the house who have guests, school etc. to decide the rule. It's not a so big deal. But if it's a rule it should apply equal to both genders and all kinds of head wear regardless if it's religiously or not. A head wear is a head wear. The only exception should be if there's any medical reasons.
In my country you are not allowed to wear even girls and boys
I wear a beret inside pretty much all the time.
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