(1) باب ذِكْرِ إِبَاحَةِ خُرُوجِ النِّسَاءِ فِي الْعِيدَيْنِ إِلَى الْمُصَلَّى وَشُهُودِ الْخُطْبَةِ مُفَارِقَاتٌ لِلرِّجَالِ
Umm 'Atiyya reported:
The Messenger of Allah (ﷺ) 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.
Reference: Sahih Muslim 890 c
In-book reference: Book 8, Hadith 12
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1934