Let me help you : It's NOT in Quran. CERTAIN interpretations of Quran say hijab is a necessity, but it was never in Quran.I’m no Islamic scholar but it’s to protect their modesty.
The interpretations are founded on hijab protecting from men's desires. So as to not draw their attention and desires because they can't "control themselves".
Now, explain to me again what is free and what isn't?
Like it or not, laicité prevents that kind of stuff. You might not like the rule, but again, respect it. I think it's a great rule. To prevent religious extremisms from any religion.