Ahmad ibn Muhammad, from Al-Hasan ibn Ali ibn Faddal, from Yunus ibn Ya‘qub, said:
I asked Abu Abdillah عليه السلام, peace be upon him, about a man who prays while wearing a burtulah (a type of garment or woolen cloak). Imam عليه السلام said: "It does not harm him."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 389