Musannaf Ibn Abi Shayba 16:655

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sa’id ibn al-Sa’ib al-Ta’ifi, from Muhammad ibn al-Sa’ib ibn Abi Hindaba, from his father, he said: I saw upon Umar a *burnus* (hooded cloak) made of *fustuq* (pistachio-colored fabric).