Musnad Ahmad 1153:658

'Abd al-Razzaq narrated to us, he said: Sufyan informed us, from Talha ibn Yahya, from 'Ubayd Allah ibn 'Abd Allah ibn 'Utbah, from 'A'ishah: "That the Prophet, may Allah bless him and grant him peace, used to pray while wearing a *mirt* (a type of garment) of these patterned ones. The Messenger of Allah, may Allah bless him and grant him peace, would pray while he had some of it on him, and I had some of it on me. And the *mirt* is from the black garments."