Get one thing in your mind , Hijab is a "Religious" obligation for men and women both in Islam .
Men are required to cover their whole body and women are required to cover face as well unless they are with their "mehram" ie: Husband , Brother , Father , Uncle , Mother , women (Female universities)
Religions are developed on certain values and with time values of people change. Just let me know on what values were these obligations made and if those values hold today.
According to me modesty in one and for women molestation was another one. As I see , both have become outdated. One can show modesty in behaviour needn't display modesty by wearing some form of clothing . As for molestation the less said the better.