The Etiquette of Women in Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 55
وَ رَوَى مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ قَالَ: «اَلْمَرْأَةُ تُصَلِّي فِي اَلدِّرْعِ وَ اَلْمِقْنَعَةِ إِذَا كَانَ كَثِيفاً يَعْنِي سَتِيراً.
Muhammad ibn Muslim narrated from Imam Muhammad ibn Ali Al-Baqir عليه السلام who said: "A woman prays in a dress (dir'aa) and a head covering (miqna'a) if it is thick, meaning it is concealing."
- Ṣaḥīḥ al-Faqīh, p. 51