"I entered upon 'Aishah with my mother and maternal aunt, and we asked her what the Prophet ﷺ 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.  

دَخَلْتُ عَلَى عَائِشَةَ مَعَ أُمِّي وَخَالَتِي فَسَأَلَتَاهَا كَيْفَ كَانَ رَسُولُ اللَّهِ ﷺ يَصْنَعُ إِذَا حَاضَتْ إِحْدَاكُنَّ قَالَتْ كَانَ يَأْمُرُنَا إِذَا حَاضَتْ إِحْدَانَا أَنْ تَتَّزِرَ بِإِزَارٍ وَاسِعٍ ثُمَّ يَلْتَزِمُ صَدْرَهَا وَثَدْيَيْهَا  

"The Messenger of Allah ﷺ would fondle one of his wives when she was menstruating, if she wore and Izar (waist wrap) that reached halfway down her thighs or to her knees.  

عَنْ بُدَيَّةَ وَكَانَ اللَّيْثُ يَقُولُ نَدَبَةَ مَوْلاَةِ مَيْمُونَةَ عَنْ مَيْمُونَةَ قَالَتْ كَانَ رَسُولُ اللَّهِ ﷺ يُبَاشِرُ الْمَرْأَةَ مِنْ نِسَائِهِ وَهِيَ حَائِضٌ إِذَا كَانَ عَلَيْهَا إِزَارٌ يَبْلُغُ أَنْصَافَ الْفَخِذَيْنِ وَالرُّكْبَتَيْنِ فِي حَدِيثِ اللَّيْثِ تَحْتَجِزُ بِهِ