The Etiquette of Women in Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 55
وَ فِي رِوَايَةِ اَلْمُعَلَّى بْنِ خُنَيْسٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ: سَأَلْتُهُ عَنِ اَلْمَرْأَةِ تُصَلِّي فِي دِرْعٍ وَ مِلْحَفَةٍ لَيْسَ عَلَيْهَا إِزَارٌ وَ لاَ مِقْنَعَةٌ قَالَ «لاَ بَأْسَ إِذَا اِلْتَفَّتْ بِهَا وَ إِنْ لَمْ تَكُنْ تَكْفِيهَا عَرْضاً جَعَلَتْهَا طُولاً.
In a narration from Al-Mu'alla ibn Khunays, he asked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام about a woman praying in a shirt (dir') and a cover (milhafa) without a waistcloth (izar) or headcover (miqna'a). Imam عليه السلام said: "There is no harm if She wraps herself in it, and if it is not wide enough to cover her, She should make it long."
- Ṣaḥīḥ al-Faqīh