Fasheh in @Downtown if it's still open. Near Jabal Amman and Shaheen service taxi. Lots of vintage frames, all between 10 and 30 Jd's that are made in Europe.
your best bet is @Downtown (al balad), try Petra St. there's a Marketplace there that sells textiles per meter. (its inside one of the buildings on the right if you're entering from Al-Hussieni Mosque St.) @Souk Al Bokharyyeh