Al-Sha'bi (may Allah have mercy on him) narrates: I heard al-Mughirah (may Allah be pleased with him) delivering a sermon on the pulpit, saying: We went out with the Messenger of Allah (peace and blessings be upon him) on a military expedition. "He (peace and blessings be upon him) went to relieve himself, and I followed him (peace and blessings be upon him) with a vessel of water. He (peace and blessings be upon him) was wearing a cloak whose sleeves were narrow, so he (peace and blessings be upon him) brought both his hands out from underneath it, then washed his face and hands, wiped his head and wiped over his leather socks."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18114