Sunan an-Nasa'i, Book 3, Hadith 27 (In-Book) ⓘ
Jumai' bin 'Umair said: "I entered upon 'Aishah with my mother and maternal aunt, and we asked her what the Prophet used to do when one of (his wives) was menstruating. She said: He would tell us, when when of us menstruated, to wrap a wide Izar around herself then he would embrace her chest and breasts.
أَخْبَرَنَا هَنَّادُ بْنُ السَّرِيِّ، عَنِ ابْنِ عَيَّاشٍ، - وَهُوَ أَبُو بَكْرٍ - عَنْ صَدَقَةَ بْنِ سَعِيدٍ، ثُمَّ ذَكَرَ كَلِمَةً مَعْنَاهَا حَدَّثَنَا جُمَيْعُ بْنُ عُمَيْرٍ، قَالَ دَخَلْتُ عَلَى عَائِشَةَ مَعَ أُمِّي وَخَالَتِي فَسَأَلَتَاهَا كَيْفَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَصْنَعُ إِذَا حَاضَتْ إِحْدَاكُنَّ قَالَتْ كَانَ يَأْمُرُنَا إِذَا حَاضَتْ إِحْدَانَا أَنْ تَتَّزِرَ بِإِزَارٍ وَاسِعٍ ثُمَّ يَلْتَزِمُ صَدْرَهَا وَثَدْيَيْهَا .
also referenced under: Hadith 375 (Reference) & Volume 1, Book 3, Hadith 375 (DarusSalam)