sam2, that isn’t correct. The Aruch Hashulchan OC75:8 says that it is assur for a woman to go outside with her hair uncovered. He is only lenient on it being erva when a man must say a bracha, and even then only if the man can’t see her hair. But even that is only as it relates to him saying a bracha in her presence. It isn’t a heter by any means for her uncovered status. He actually decries the practice in very strong language there.
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