Musnad Ahmad 1153:373

Abdullah ibn al-Walid narrated to us, he said: Sufyan narrated to us, from Talhah ibn Yahya, from Ubaydullah ibn Abdullah ibn Utbah, from Aisha, she said: "The Messenger of Allah (peace and blessings of Allah be upon him) used to pray while he was wearing a *mirt* (a garment), and I was [covered] by some of it."