عَنْ مَيْمُونَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يُبَاشِرُ نِسَاءَهُ فَوْقَ الْإِزَارِ وَهُنَّ حُيَّضٌ
It is narrated from Sayyida Maymunah (RA) that the Messenger of Allah (peace and blessings be upon him) would use the upper part of his wives' lower garment while they were in the state of menstruation.