
surah 24:30–31, te la pongo en English:
And tell the believing women to lower their gaze and be modest, and to display of their adornment only that which is apparent, and to draw their veils over their bosoms, and not to reveal their adornment save to their own husbands or fathers or husbands' fathers, or their sons or their husbands' sons, or their brothers or their brothers' sons or sisters' sons, or their women, or their slaves, or male attendants who lack vigour, or children who know naught of women's nakedness. And let them not stamp their feet so as to reveal what they hide of their adornment. And turn unto Allah together, O believers, in order that ye may succeed.
http://www.quranexplorer.com/Quran/
Mi opinión personal? es que la mujer decida qué es para ella el hijab y punto, ya que no dice explícitamente que cubran todo su cuerpo de tela...sólo su pecho y sus adornos/bellezas (Lo que en mis tiempos se le llamaba al cul*, tetas, muslos, cintura, etc.) vamos, no ir vestida como una PuT@
Mi madre es musulmana y no llevó hijab hasta ir a la meca hace poco, mi mujer es musulmana de NY, Orange County, de padres protestantes y no lleva velo, ni la obligo, y la verdad, no querría que lo llevara

Be sure to ask me whatever something bothers you or you cannot understand about islam and we can discuss about it if u want

cheers