I dunno the answer...statistically...but..I'd say relatively common. I've seen a girl wearing ears (she made herself, actually) which attach to her various hats here in the city. My daughter has a pair of 'kitty ears' that she got at some animé convention last year and which she wears all the time, usually with a tiara (don't ask!).
So, yeah...I'd have to say relatively common.
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