Yahya related to me from Malik that he had heard that A'isha, thewife of the Prophet, may Allah bless him and grant him peace, used topray in a shift and head-covering. (DE)
App reference (DE): Book 8, Hadith 36 (DE)
USC-MSA web (English) reference: Book 8, Hadith 36 (DE)
Arabic reference (DE): Book 8, Hadith 325 (DE)