It's funny how people point out a host of garb from other countries and even berate this woman for not wearing the latest fashions derived from those fresh from Paris, France, and can ignore the fact that her traditional garb is the only actual American outfit in the room. Next thing, y'all will be telling her to go back if she doesn't like it here.
If you know enough about her politics to not like them, harp on that. Not the idea of wearing something as traditional for ceremonies among her people as a tuxedo or evening gown is for y'all. And please keep in mind that what she is wearing is traditional American, not some knock off from some other country or continent.