Kayline used to make a repro of the canvas. It was OK. I think they are still available somewhere.
ehsankiani on this board is in Pakistan, and ships complete factory style tops including bows from Pakistan periodically through group orders. Search, I believe there is a group order going in now. His top is nice, however the last top I saw (from the first batch he sent over) had problems with the hardware rusting.
Toyota tops were made of canvas impregnated somehow. Some of the aftermarket tops are made of vinyl with a feel of plastic - a smooth and even shiny texture that is not like the original tops.
The material used in the tops sold by SOR is possibly the most realistic in that it has a canvas - like texture and is very well made by Specialty Top, I believe. There are differences in the side window configuration that may or may not be For some reasom Marvin offers only grey or black in the OEM style.