Cotton Duck I think I know what you mean. There is an ebay store that has some interesting 10z stuff: DISCOUNT UPHOLSTERY DRAPERY FABRICS. They call it "Duck Canvas," and have it in at least 10z weight. Also, Stuart of Lost Worlds has some great 15oz cotton duck. Check out the sample that is about 9 items down on his list of limited editions: http://www.lostworldsinc.com/Lost_Worlds_Limited_Edition_Jackets.htm He's even got it in 4 colors. I like that peacoat!