Musannaf Ibn Abi Shayba 16:403

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from Hisham ibn Urwah, he said: I saw upon Abdullah ibn al-Zubayr, and Urwah ibn al-Zubayr, and upon Abu Bakr ibn Abd al-Rahman ibn al-Harith ibn Hisham, garments of silk (khazz).