I work in an Islamic school where many of my students and fellow teachers are Muslim. Some of the girls only wear the hijub (head scarf) because it is part of their school uniform while others also chose to wear a veil also, which gives them a ninja look. As I understand it, the reasoning behind women in Islam having to cover up is just to protect them from lecherous old men. The same reasoning behind any father telling his daughter "You are not going out wearing THAT!"

As a teacher I personally don't like my students wearing a veil (ninja look) because it makes it almost impossible to read the student's face. Most students won't tell you if they understand, or what they are thinking. You have to read their faces. But this isn't a big concern as I only have one student who chooses the ninja look.

However, some of the mothers chose to wear the full black birqua where as most just wear a head scarf. But this in itself is helpful because it lets me know that I have to make sure I behave extra appropriately around the birqua clad mothers.