Even that is over-reaching, I think. Where I come from, costume is not restricted to dressing as something you aren't, or Halloween. We have a lot of festivals around here, celebrating various heritage groups (Norwegians, Greeks, Italians, Irish, NA, etc etc). I have never heard anyone not refer to traditional "costumes". Now, 'regalia' typically does have a different connotation - as in 'overdone' or 'exaggerated'. But that's around here, so I would not tell someone it's seen that way "in the US". The US is a pretty big place, after all.
Fair enough. But in my experiences across the US from the midwest where I live, to the plains, to the southwest which is my traditional home, to the reaches of Alaska, I've always heard "regalia" or "clothing" (with various adjectives such as "traditional" or "ceremonial") as the term for Native American clothing from various traditions. I have never once heard another Native American refer to traditional clothings as a "costume".
My perspective on this is informed from what I have heard from other natives around the US.
The only time I have ever worn a Native American "costume" was when I played a part in my high school production of Peter Pan. And today, I deeply, deeply regret that.
For reasons probably beyond the scope of this thread.
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