It is a common question that: why women should cover their body and hair?
We should know a little about Islamic precept: God never obligates anything except it benefits human being. And Hijab has been obligated because of the family.
In comparison Islamic covering with western culture, which named women freedom we understand:
The family in western country is shaken, because in this culture women are in competition of using makeup. And the men - who are the winner of this competition and women freedom - try to have various partner. And the real losers in this culture are women and children.
Islam believes in finding the fulfillment of sexual desires within the
family environment, so a woman never uses makeup and never shows his
body and hair and charming in front the stronger.