Yahya related to me from Malik from a reliable source from Bukayribn Abdullah ibn al-Ashajj from Busr ibn Said that when Ubaydullah ibnal-Aswad al-Khawlani was in the room of Maimuna, the wife of theProphet, may Allah bless him and grant him peace, she used to pray ina shift and head-covering, without a waist-wrapper.
App reference: Book 8, Hadith 38
USC-MSA web (English) reference: Book 8, Hadith 38
Arabic reference: Book 8, Hadith 327