Sir Duncan Bruce of Logan and Sir Gawayne ap Tristam have an article on making silk banners/standards. The article is located on the Barony of Forgotten Sea website.

http://www.bfs-kc.org/home/How-To-Guides/silk-standard-making

Several folks have made these, and HE Logan has conducted classes and workshops on their construction.

This is an excellent way to easily add a bit of medieval splendor to your camp.