The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1934
Umm 'Atiyya reported: The Messenger of Allah (may peace be upon him) commanded us to bring out on'Id-ul-Fitr and 'Id-ul-Adha young women, menstruating women and purdah-observing ladies, menstruating women kept back from prayer, but participated in goodness and supplication of the Muslims. I said: Messenger of Allah, one of us does not have an outer garment (to cover her face and body). He said: Let her sister cover her with her outer garment.