Cuties, this is how I made my bowl cozy. There are plenty free patterns on the internet, all with similar directions.

For each bowl you will need:
Two 10 inch squares of 100% cotton fabric
Two 10 inch squares of Wrap-N-Zap only, because it's 100% cotton
100% cotton thread
* everything has to be 100% cotton if you plan to microwave. The precautions are on the W&Z package.

Step 1-Cut 2 fabric and 2 Wrap-N-Zap 10 inches square.
Step 2-baste each sq of Wrap-N-Zap to each sq fabric
Step 3-mark 4 darts on Wrap-N-Zap side by folding sq in half, measure & mark 1in from fold at top edge and 2 1/2 inch down from top edge. Now place a ruler at both marks and draw a line, to mark your dark. I use an ink pen to mark, because it's hard to make on Wrap-N-Zap.Do this for all 4 darts. DO NOT make darts yet.
Step 4-On FABRIC side, I place a pin at the very center of my square. I also place a pin at each point of where my dart will end on all 4 points. Starting in center, I start stitching in a circle. It doesn't have to be perfect, mine sure aren't. I go around until my sewing foot starts to be close to my 4 pins. Don't stitch up to the pins or too close, because your bottom will be too far up.
Step 5-Now find a can or anything round to place at each corner, while your sq is still flat to round each corner. Place the Can on fabric with the round edge so it touches the edge of your fabric on each side of the corner, Draw and cut (I just cut with my rotary) a round edge, on each corner.
Step 6-Now stitch darts on all squares, trim.
Step 7-place two squares, FABRIC sides together and stitch, with walking foot if you have one, it will make so much easier. Stitch all the way around EXCEPT leave an opening on a straight edge to turn right side out.
Step 8-turn right side out and top stitch close to outer edge all the way around to close up your opening during top stitching. Press as best you can.Enjoy!-Toogie

I hope I have not forgotten anything. Correct me if you think I did.-T