That makes about as much sense as saying it's simply impossible for Ford Motor Company to ever, ever manufacture steel in the U.S. Griege is the raw material Standard Textile uses to make their finished fabric. They don't manufacture their raw materials. They buy them from a supplier, just as auto companies buy the aluminum and steel they use to make their autos. Cost of the raw materials goes up, cost of finished product goes up as well, and cheaper foreign sources get the customers. Basic finance and elementary economics.
There's a name for it. Vertical integration. Look it up. This was once the norm in textiles.