Let’s remember that, at least at the beginning, Mary was a practicing Jew. Her clothing would be more accurately described as that of a practicing Jew of her time period.
At the time that Mary lived on the Earth, Islam did not exist, and it did not come into existence until several hundred years later. Since there are some common origins to Judaism, Christianity & Islam, many of the practices of Islam have been borrowed from Judaism and Christianity. So it might be more accurate to say that many Muslims of today appear the same as people in the past of the Jewish faith appeared, not the other way around. Let’s get it right!
So Mary, in her appearances, does not look like a Muslim, she looks like the person she was ~ a Jewish mother who became the first Christian.