I have made a few items with both wool and wool flannel. I tend to buy kits for these things and most of the time it says
that it's already felted. The pieces that I'm not sure about - well, I tend to leave them alone. I usually make table toppers with wool and runners. I assume that it will not be washed, so I just make it and don't worry about it. It may bite me in
the butt someday, but so far so good.