Al-Husayn ibn Sa‘id, from Sulayman ibn Ja‘far al-Ja‘fari, who said:
I saw Abu al-Hasan al-Ridha عليه السلام, peace be upon him, praying in a cloak made of khazz (a type of fine fabric).
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 226