From him, from Al-Abbas ibn Amir, from Hajjaj Al-Khashshab:
I asked Abu Abdullah عليه السلام about what is permissible for a husband with his menstruating or postpartum wife. Imam عليه السلام said: "She should wear a long garment (dir‘) and then lie down with him."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 162