Well, Hijab is equally important for all Muslims, no matter what school of thought one belongs. Quran has very clear instruction about. Whether you name it niqab or burka, it doesn't matter.
Allah say’s in
Quran “O you Children of Adam! We have bestowed on you raiment to cover your shame as well as to be an adornment to you. But the raiment of righteousness, that is the best. Such are among the Signs of Allah, that they may receive admonition.” (Quran 7:26).
Veil or Hijab is the dress code for the women in Islam. It is obligatory for the Muslim women to cover their body completely in accordance with the teaching of Holy Quran. Allah Almighty has narrated the dress code for the Islamic women in Holy Quran. Here are some verses of Quran which show the importance of hijab in Islam.
"And say to the faithful women to lower their gazes, and to guard their private parts, and not to display their beauty except what is apparent of it, and to extend their head coverings to cover their bosoms, and not to display their beauty except to their husbands, or their fathers, or their husband's fathers, or their sons, or their husband's sons, or their brothers, or their brothers' sons, or their sisters' sons, or their womenfolk, or what their right hands rule (slaves), or the followers from the men who do not feel sexual desire, or the small children to whom the nakedness of women is not apparent…" (Surah An Nur: 31)