Let's start with the Ayat from Quran. { ياأَيُّهَا النَّبِيُّ قُل لأَزْوَاجِكَ وَبَنَاتِكَ وَنِسَآءِ الْمُؤْمِنِينَ يُدْنِينَ عَلَيْهِنَّ مِن جَلاَبِيبِهِنَّ ذالِكَ أَدْنَى أَن يُعْرَفْنَ فَلاَ يُؤْذَيْنَ وَكَانَ اللَّهُ غَفُوراً رَّحِيماً } الأحزاب:59 “O Prophet! Tell thy wives and thy daughters, and the women of the believers, that they should pull down upon them of their outer cloaks (from their heads over their faces). That is more likely that they may thus be recognized and not molested. And ALLAH is Most Forgiving, Merciful"