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Chilly Dog has a good point. They usually wear visors or baseball-style caps, no? I believe the main point of the hijab is to cover the hair.
I bet this McDonalds has other Muslim women employees. What do they wear? It appears this particular manager said exactly the wrong thing to exactly the wrong people. I guess he could have told them they needed to wear regular McDonalds headwear, with maybe a dewrag underneath, if they wanted to cover all their hair.