--A page devoted to the Cotehardie and various other garments. Very helpful, though it changes frequently.
--An online seller of diverse historic patterns--one of the best selections I've seen. Some patterns are more historically accurate than others. If you are in the S.C.A. or have the privilege of attending events, look for patterns there first, they are often less expensive, but the price of patterns here is reasonable.
--This page has simple directions for making a Duct Tape Double. The simple instructions are free, though she's willing to send you extensive directions for a price. There are accounts from people who have tried the process that you may find of use. I found the duct tape pattern worthwhile when making my cotehardies.
--This page has more costuming links than I could ever hope to publish on this page. Enjoy!
--Another useful page that has more links than I could ever hope for.
--Courtesy of www.costumes.org
--A useful place to get period pictures for documentation. Very helpful!
--A wonderful webpage devoted to the illuminated manuscript.