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. (IT)
App reference (IT): Book 8, Hadith 36 (IT)
USC-MSA web (English) reference: Book 8, Hadith 36 (IT)
Arabic reference (IT): Book 8, Hadith 325 (IT)