Musannaf Ibn Abi Shayba 3:816

Sufyan narrated to us, from Uthman ibn al-Mughirah al-Thaqafi, from Salim ibn Abi al-Ja'd, from Muhammad ibn al-Hanafiyyah, who said: Ali said: "If a man prays in a single garment, let him wrap it around himself (yatawashshah)."