Why are so many Americans against Muslims wearing hjabs and burkas when Christian Nuns wear burkas and hjabs as well?

This proves its more of a religious problem they have and not a problem with the clothes and that whole excuse they keep making that it oppresses women. But when a Nun covers herself its not oppressing women and people don't seem to have a problem with it.
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Sorry I didn't mean to be offensive not just Americans people from all over the world.
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Habits burkas what ever the point is they both cover themselves from head to toe and the only difference is nuns don't wear face veils.
Why are so many Americans against Muslims wearing hjabs and burkas when Christian Nuns wear burkas and hjabs as well?
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