Hadith: The Messenger of Allah (may Allah's peace and blessings be upon him) used to offer the Fajr prayer while some women from among the believers, wrapped in their garments, would attend the prayer with him. Then they would return to their homes, and no one would recognize them because of the darkness

عن عَائِشَة رضي الله عنها قالت: (لقد كان رسولُ الله صلى الله عليه وسلم يُصَلِّي الفَجر، فَيَشهَدُ معه نِسَاء مِن المُؤمِنَات، مُتَلَفِّعَاتٍ بِمُرُوطِهِنَّ، ثم يَرجِعْن إلى بُيُوتِهِنَّ مَا يُعْرِفُهُنَّ أحدٌ من الغَلَس).
[صحيح] - [متفق عليه]

‘Ā’ishah (may Allah be pleased with her) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) used to offer the Fajr prayer while some women from among the believers, wrapped in their garments, would attend the prayer with him. Then they would return to their homes, and no one would recognize them because of the darkness.
[Authentic hadith] - [Narrated by Bukhari & Muslim]

Explanation

‘Ā’ishah (may Allah be pleased with her) mentions that the female Companions used to cover themselves with their garments and attend the Fajr prayer with the Prophet (may Allah's peace and blessings be upon him). They would then return to their homes after the prayer at the time when the darkness of the night mixed with the faint light of the morning, and the one looking at them would not recognize them because of the remaining darkness.