It is narrated from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) went out to relieve himself, and I went with him carrying a vessel of water. The Messenger of Allah (peace and blessings be upon him) was wearing a Syrian cloak. When the Messenger of Allah (peace and blessings be upon him) had finished relieving himself, he performed ablution (wudu) and wiped over his leather socks.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17983