Musnad Ahmad 1167:31

Yahya ibn Sa'id narrated to us, from 'Abd al-Malik, who said: 'Abdullah, the freed slave of Asma', narrated to us, from Asma', who said: "She brought out to me a *jubba* (outer garment) of *tayalisa* (a type of Persian garment), upon which was a patch of a span's length of Kisrawani (Persian) silk, and its two openings were hemmed with it." She said: "This is the *jubba* of the Messenger of Allah, may Allah bless him and grant him peace, which he used to wear. It was with 'Aisha, and when 'Aisha passed away, I took possession of it. We wash it for the sick among us, seeking healing through it."