I use muslin a lot. There are several companies that make a good muslin Kaufman Kona, Moda Bella, Roc Lon. I would suggest that you use one that has no less than 60 threads in a square inch. Roc Lon makes a muslin that is 70 threads per square inch that I prefer when I hand quilt. I can get more stitches per inch with that muslin. Unfortunately, the manufacturers don't put the thread count on the bolt but you can research on line. Kaufman Kona and Moda Bellas have a 60 threadcount. Joann fabrics carries Roc Lon, but it does NOT have a 70 thread count. I don't think it is even 60. I buy my Roc Lon on line.