I have a DVD by Nancy’s Notions called “Easy Silhouette Wardrobe”. It shows how to make a single layered vest useing felted wool. The DVD instructs us to wash our wool in cold water in a washing machine and tumble dry low in order to felt the wool. I have some wool garments that I would like to take apart and felt in order to try making one of these vests. By-the-way, the single layer vests are only serged around all the outer edges and this looks pretty neat. However, my previous experience with woolens was wash cold/dry flat to keep from felting . I would think that the wool would felt just as well with hot water or perhaps that would make the wool too hard. Would appreciate input from anyone who has any expertise with this procedure. THANKS!