Musnad Abu Ya'la al-Mawsili 245:20

Ibrahim ibn al-Husayn al-Antaki narrated to us, Mubashir—meaning ibn Isma'il al-Halabi al-Kalbi—and al-Harith ibn 'Atiyyah and Muhammad ibn Kathir narrated to us, from al-Awza'i, from Ya'ish ibn al-Walid, from Mu'awiyah ibn Abi Sufyan, who said: I entered upon Umm Habibah, the wife of the Prophet, may Allah bless him and grant him peace, while the Messenger of Allah, may Allah bless him and grant him peace, was praying in a single garment. I said, "Do I not see him praying as I see [myself]?" She said, "Yes, and it is the same garment in which he was [in] whatever he was [in]."