Yahya related to me from Malik from Ibn Shihab that Said ibn al-Musayyab said that Abu Hurayra was asked, "May a man pray in onegarment?" He said, "Yes." The man then said to him "Do you do that?"and he replied, "Yes, I pray in one garment while my clothes are onthe clothes-rack."
App reference: Book 8, Hadith 32
USC-MSA web (English) reference: Book 8, Hadith 32
Arabic reference: Book 8, Hadith 321