Here is a site that has instructions for sewing one.
http://www.getcreativeshow.com/seminars/tea_cozy.htm

Here is a link that might be useful: Tea Cozy Sewing Instructions

that previous tea cozy pettern is great and can be made greater by adding elastic to the ribbon so you never have to untie it, just slip it over the pot with the spout and handles extending from either end. I make them and sell them all the time.