Aha! I found a few links, it is for draperies, or home decorating!
It says "drapery cotton"
http://cgi.ebay.com/ws/eBayISAPI.dll..._263622&UA=%3F*I8&GUID=f7a14a7012a0a06c1c41af91ff512342&itemid=350123173704&ff4=263602_263622
http://www.onboardfabrics.com/produc...cat=57&scat=67