I made my son's girlfriend a rag quilt and I did use batting. I dont remember the name of it, but it was a real thin cotton. I used flannel on the top and bottom.
The quilt was "snuggly soft" as the gf put it. It was warm, but not heavy....she loves it! She took it to the hospital with her when she had surgery on her knee and she takes it to the theater with her so she can get all cozy while watching movies...lol