5. The hijab is Taqwah (Righteousness)

Allah (subhana wa'atala) says in the Qur'an:
O children of Adam! We have bestowed raiment upon you to cover yourselves (screen your private parts, etc) and as an adornment. But the raiment of righteousness, that is better.'(S7:26).

The widespread forms of dresses in the world today are mostly for show off and hardly taken as a cover and shield of the woman's body. To the believing women, however the purpose is to safeguard their bodies and cover their private parts as a manifestation of the order of Allah. It is an act of Taqwah (righteousness)