And from him, from Safwan, from Abdur-Rahman ibn al-Hajjaj:
Abu al-Hasan عليه السلام, peace be upon him, said: "It is not obligatory for slave women to cover their heads in prayer, and it is not appropriate for a woman to pray except in two garments."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 231