Flannel makes a great liner/batting for warmer areas. Again, especially flannel that's been washed and even dried to death, you don't want it to shrink or bleed. Maybe it is just one of my biases against flannel but I feel it bleeds terribly, I've had red flannel "crock" into a white background Christmas print it was stored next to.
Just wanted to share that last week I was doing some costuming work with high quality flannel. Because I didn't have patterns I was using large (1") seams and had my pinking shears out and realized none of us mentioned pinking yet. It's been about 20 years since I did anything other than quilting, and my hubby had never seen the shears -- we've been together and married for over 15 years. But it's another thing to help.
Some people seem to have a knack with flannel I don't have. I love my flannel nighties, but I just don't like working with it!