There are all grades of muslin, just like regular fabric. I, personally, buy the very best I can from JoAnn's when I am able to use my 50% off coupon. I buy 10 yds at a time, preshrink it and wrap it on a core board that the store is happy to let me have. It does shrink a lot, even the good stuff, so factor that in your purchase. I use muslin often on my quilts and have never had a problem....The last I bought was "Legacy....96inches wide" from JoAnn's......cost, with coupon....approx. $5 per yard......