Here are some sites that specialize in Civil War/reproduction fabrics.
Trinity School House Quilt shop even has date ranges on their web site. This is an adorable shop at the southern end of the Shenandoah Valley of Virginia in a old two story brick school. They specialize in mid 1800s repro fabrics.
http://www.reproductionfabrics.com/
http://www.hancocks-paducah.com/SHOP...uction-Fabrics
http://www.trinityquilts.com/category.php?category_id=4
Jan in VA