Sayyiduna Kaysan (may Allah be pleased with him) narrates that he saw the Messenger of Allah (peace and blessings be upon him) coming out from the place of kitchens and going to the place of the well. He (peace and blessings be upon him) was wearing only an izar (lower garment) and did not have an upper sheet on. The Prophet (peace and blessings be upon him) saw some slaves praying near the place of the well, so he also took off his izar and used it as a covering, and then performed two rak‘ahs. I do not know whether it was Zuhr or ‘Asr.