First we found some nice fabric and some bowls, lids and plates to use as templates. Remembering that a using a large bowl to trace would result in a medium bowl cover we used a super large mixing bowl, a large plate and the cover from a large tub of ice cream. I also wanted a cover for 9 X 13 pans so I used one of mine and traced around it adding about 2 inches on all sides.
We then cut out two of each size we were making. With wrong sides together we began sewing and stretching 1/4 inch elastic around the perimeter of the fabric using a stretch zig zag stitch. We sewed the elastic about 1/4 inch inside the two layers of fabric. Once the elastic was stretched and stitched I zig zagged along the very edge of the fabric so you would not be able to see the elastic. I did not measure the elastic I just stretched it as I sewed and when I got to the place where I had started I cut it off and carefully stitched the end.