It wasnarrated that Umm 'Atiyyah said:
"The Messenger of Allah (ﷺ)commanded us to bring them (the women) out on the day of Fitr and theday of Nahr." Umm 'Atiyyah said: "We said: 'What if one ofthem doesnot have an outer covering?' He said: 'Let her sistershare her ownouter covering with her.'"
English reference: Vol. 1, Book 5, Hadith 1307
Arabic reference: Book 5, Hadith 1367