Step 3: Cut your muslin
Now, I want each square to be 12" square when I'm completely finished. You by no means have to do this same size. Just be sure, that whatever size you want to end up with, that you add seam allowances onto all of the size. I like to use 1/4" seam allowance, so that means that I'm cutting a muslin square that is 12 1/2". This muslin square will serve as the base for the block, so you want it to be perfectly square, so take the time here.