I was also going to suggest contacting a custom curtain place if the fabric isn't too heavy. If it's pretty thick, you might try searching for industrial custom sewing.
I was friends with a woman who made custom curtain and draperies for a few local interior designers. In an odd turn of events, we had opportunity to work on some non-drapery pieces and used her shop, so I have a little inside information on this. Drapery material is often very thick and heavy. Believe me, her machines could handle anything from the heaviest tapestry to the very sheerest of fabrics.
All that is a long way of saying....maybe contact an interior designer or two for information on local drapery makers.