I began the project by finding a circular plate, that was the right size, to trace the desired shape from. I had some left over thick foam, which can be purchased at fabric stores, and I cut the circle shape out of them. (Tip: compress the foam when you cut it, to get a smooth cut)
Then I cut out two fabric circles a little larger than the foam. Placing the "right" sides together, I stitched around the circle with the sewing machine, leaving several inches open. Then, I turned the fabric inside out, so that the "right" sides would be facing out. To insert the foam circle, I rolled it up like a burrito, and put it in the opening. Once inside, I unrolled the foam and positioned it correctly in the seat fabric. The opening still needed to be stitched up, similar to stitching a pillow opening.
After that, all I needed to do was add the khaki colored trim (bias tape) with a contrasting thread, and add little ties with the same trim. I decided to hand sew this on to add more texture and color to the trim, and I think it adds charm. :)
Now, we can sit at the bistro table with ease!