Sewing - removable and reversible cover for a large hot pad - GA

I made a cover for one of the large hot pads (insulbrite, knitted wool, cotton batting) I made a while back using four different fabrics.  It is removable for washing and also reversible with four different options.  The pad measured 11" x 17".  I cut my rectangles to 11.75" x 18.75" and sewed a 1/4" seam when I was putting it together.  I left an opening on one side and turned it right sides out and then hand stitched the opening closed.  I top stitched both edges and then added two more rows of stitching to keep the cover integral when washing it.  We have such beautiful fabrics available for sewing!!

Therese