When Messenger of Allah ﷺ finished the Fajr prayer, the women would leave covered in their sheets and were not recognized owing to the darkness.
إِنْ كَانَ رَسُولُ اللَّهِ ﷺ لَيُصَلِّي الصُّبْحَ فَيَنْصَرِفُ النِّسَاءُ مُتَلَفِّعَاتٍ بِمُرُوطِهِنَّ مَا يُعْرَفْنَ مِنَ الْغَلَسِ