Prayer (Kitab Al-Salat)
Dawud :: Book 2 : Hadith 629
Narrated Talq ibn Ali al-Hanafi:
We came to the Prophet (peace_be_upon_him), and a man came and said: Prophet of Allah, what do you say if one prays in a single garment? The Apostle of Allah (peace_be_upon_him) then took off his wrapper and combined it with his sheet, and put it on them. He got up and the Prophet of Allah (peace_be_upon_him) led us in prayer. When he finished the prayer, he said: Does every one of you have two garments?