The first thing I had to do was measure my sewing machine. Mine is 16" wide (from side to side), 12" high (from the work surface to the highest point of the machine and 8" deep (from front to back at its widest point).
For this I needed two rectangles of each fabric 9" by 13" and one rectangle of each fabric 33" by 17". For the batting I needed two rectangles 8" by 12" and one rectangle 32" by 16". The batting is smaller than the fabric to allow for ragging the seams.
Lay one of the small rectangles in line with one corner of the large rectangle and pin along the 13" edge. Manipulate the fabric of the large triangle to create a corner so that you can continue pinning the next edge of the small triangle along the same edge. Continue until three sides of the small rectangle are pinned all along one edge of the large rectangle, as shown in the right hand photo.
Add quilt binding as for a normal quilt and you have a sturdy sewing machine cover that can be turned whichever way you want, depending on which fabric you want to see.
It's often easier to follow on video:
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