I bought some stuff good nylon from these people in Liverpool
https://www.abakhan.co.uk/I can't remember exactly, but I bought about 2m of fabric, and a load of Velcro piping for about £12 ish.
It would be difficult to order straight off the internet, without being able to look closely & feel what you're buying. I would suggest to go to a fabric warehouse similar to the one above, find the material you're looking for regardless of colour, then go on the net if needed to source the same type of material in the colour you want.
I bought some white nylon to get some repro Skyway handlebar pads made up, as I ruined my OG one by stupidly putting it in the washing machine.
Here's some pics of the fabric:
The bar pad is a repro. The stem pad is OG.
The top pad is OG, the bottom one is a repro
My repro (Left), OG (Centre), and the cheap copies that are for sale on ebay etc at the moment (Right)- see that the material is much coarser.