What about the Christian tradition? It is well known that Catholic Nuns have been covering their heads for hundreds of years, but that is not all. St. Paul in the New Testament made some very interesting statements about the veil:
"Now I want you to realize that the head of every man is Christ, and the head of the woman is man, and the head of Christ is God. Every man who prays or prophesies with his head covered dishonours his head. And every woman who prays or prophesies with her head uncovered dishonours her head - it is just as though her head were shaved. If a woman does not cover her head, she should have her hair cut off; and if it is a disgrace for a woman to have her hair cut off or shaved off, she should cover her head. A man ought not to cover his head, since he is the image and glory of God; but the woman is the glory of man. For man did not come from woman, but woman from man; neither was man created for woman, but woman for man. For this reason, and because of the angels, the woman ought to have a sign of authority on her head" (I Corinthians 11:3-10).
From all the above evidence, it is obvious that Islam did not invent the head cover. However, Islam did endorse it. The Quran urges the believing men and women to lower their gaze and guard their modesty and then urges the believing women to extend their head covers to cover the neck and the bosom:
"Say to the believing men that they should lower their gaze and guard their modesty......And say to the believing women that they should lower their gaze and guard their modesty; that they should not display their beauty and ornaments except what ordinarily appear thereof; that they should draw their veils over their bosoms...." (Quran 24:30,31).
The Quran is quite clear that the veil is essential for modesty, but why is modesty important? The Quran is still clear:
"O Prophet, tell your wives and daughters and the believing women that they should cast their outer garments over their bodies (when abroad) so that they should be known and not molested" (Quran 33:59).