To answer this question I must look to the named the Holy Qur’an, which Muslims claim to be the divine word of God.

The Qur’an states;

As you can see, Muslim women are commanded to cover their hair and not display their body to any male outside their family. If you anyone says a woman has a choice to wear hijab they are wrong. Although, there are lots of commandments that people don’t follow. You can still choose to follow a commandment.

The Prophet also said that when a girl reaches the age of menstruation it doesn't suit here that she shows parts of except her hands and face.