This was once a tricky question for me too when I was a student, I asked a lot of teachers and they told me that it depends on what you want to represent, so both terms are grammatically correct I suppose.
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Anonymous is it "in the evening everybody puts on their coat" or should it have to be "their coats?"We normally use the plural form in BrE. 'Their' is natural; 'his or her' is not.