Sourcing cotton duck in Europe for yurt construction

We're planning to build a yurt ourselves as a prototype for a possible business venture & I'm trying to find a way to source 10 or 12oz cotton duck for the covering. We are in France so ideally I'd like to find a European supplier, possibly in Turkey, who could eventually offer us wholesale quantities. Does anyone have any recommendations on how to track down a decent supplier? Any advice appreciated, thanks!