I am a relatively uninformed person. I was curious about Islam and the types and particularly how to identify one type of another. Example, when I was in high school there was only like 2 muslim girls I ever recall seeing. One would never wear a Hijab but I knew she was Muslim because she mentioned something about Ramadan. The other girl in the school was like FULL ON BLACK SHEETS down to her feet. So why could one Muslim girl wear regular clothes. And the other had to wear sheets? They seemed nice in general though. I didn't meet a muslim woman that wore just the hijab part and not the sheet part until college where it was a bit more diverse I guess. So between the sheets, no sheets and then just the hijab. Which Muslim type is which?