Muwatta Imam Malik Book of Prayer in Congregation, Hadith 38

Yahya related to me from Malik from a reliable source from Bukayr ibn Abdullah ibn al-Ashajj from Busr ibn Said that when Ubaydullah ibn al-Aswad al-Khawlani was in the room of Maimuna, the wife of the Prophet ﷺ she used to pray in a shift and head-covering, without a waist-wrapper.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ الثِّقَةِ، عِنْدَهُ عَنْ بُكَيْرِ بْنِ عَبْدِ اللَّهِ بْنِ الأَشَجِّ، عَنْ بُسْرِ بْنِ سَعِيدٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ الأَسْوَدِ الْخَوْلاَنِيِّ، وَكَانَ، فِي حَجْرِ مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ مَيْمُونَةَ كَانَتْ تُصَلِّي فِي الدِّرْعِ وَالْخِمَارِ لَيْسَ عَلَيْهَا إِزَارٌ .