I made 6 rag quilts for Christmas this year. They were all made out of flannel, and I used flannel for the batting too. 2 of the quilts ragged beautifully, and the other 3 did not. All of them were sewn the same way - 1/2" seam allowances, cut the seam allowances in less than 1/4" spaces. I posted before asking the same question, and didn't get a response. So I will be interested to see if anyone has any other thoughts. I think I remember someone posting on this site that she used a toothbrush to help fluff the seams. Does anyone else remember this, or am I having a senior moment?