Flannel comes in many weights from very flimsy (in my opinion) to the hefty flannels used in "chamois" flannel shirts sold by L.L. Bean and Eddie Bauer.
It also can come made of different fibers. Not all "flannel" is made of 100% cotton. Check the ends of the bolt for content and care of the fabric.
I am one that now soaks all fabrics that will go into a quilt in hot (as hot as I can get from the faucet) water for an hour or two. Then it goes in a very quick, gentle wash with a tiny bit of detergent and dry until "done." (I usually use the "how dry" setting instead of the timer on the dryer) I feel that agitation is what makes washed fabric look "used" rather than the washing itself.
I have had some flannels have almost no shrinkage - some have shrunk a lot.




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