"The women used to pray Subh with the Messenger of Allah ﷺ, wrapped in their wrappers, then they would return, and no one would recognize them because of the darkness." (Using translation from Nasāʾī 546)  

«كُنَّ نِسَاءُ النَّبِيِّ ﷺ يُصَلِّيَنَّ مَعَ رَسُولِ اللهِ ﷺ الصُّبْحَ مُتَلَفِّعَاتٍ بِمُرُوطِهِنَّ فَيَرْجِعْنَ وَمَا يَعْرِفُهُنَّ أَحَدٌ مِنَ الْغَلَسِ»  

The Messenger of Allah ﷺ would say the Fajr prayer after which the women would depart wrapped up their woolen garments, being unrecognizable because of the darkness before dawn. (Using translation from Abū Dāʾūd 423)  

«إِنْ كَانَ رَسُولُ اللهِ ﷺ لَيُصَلِّي الصُّبْحَ فَيَنْصَرِفُ النِّسَاءُ مُتَلَفِّعَاتٍ بِمُرُوطِهِنَّ مَا يُعْرَفْنَ مِنَ الْغَلَسِ»