Originally Posted by ckcowl
the muslin is simply a foundation, helps keep everything square, a bit easier to work with. if using scraps sometimes they are off grain and stretchy, a foundation will help, and muslin doesn't have to be removed like paper does it just remains part of the quilt.
That's why I use muslin - for stability. I don't have to worry if my strips (usually scraps) are on the bias or not. I'm working on one right now.