1. gdl's Definitive This is Why Navy Odd Trousers are Good (flannel or worsted). 2. Olive flannel sounds interesting. 3. Copper flannel or lightweight tweed. 4. Air Force/RAF Blue/Grey flannel or worsted. 5. Large scale houndstooth flannel like this: Also, I received the Sherry Tweed check jacket yesterday. The team at NMWA that picked the fabric did an outstanding job.