First of all cut a pattern that measures 7 1/2" wide by 14 1/2" long.
Cut 2 pieces of fabric from your pattern. They can be alike or different. One will be your face fabric and the other will be the lining of your checkbook.
With right sides together pin the 2 pieces of fabric around all edges marking with your pins the area you will leave open to turn the fabric once it's sewn.
Using a 1/4" seam allowance sew around all sides of your fabric remembering to leave an opening to turn the fabric. Backstitch at beginning and ending of sewing to secure your stitches. Trim corners being careful not to get too close to stitching.
Turn fabric inside out making sure corners are sharp and pulled out. Roll fabric between your fingers to get stitching line up and press all sides. What I mean by this is it shouldn't look like a ditch when it's pressed. Measure 3 1/4" from the end on each end of cover and mark with a pin. This will be your fold line.
Make sure the right side of your cover is down and the lining side is up. If you are using the same fabric for both it really won't matter. Fold the bottom part of the cover up at the pin markings. Remember I said this would be your fold line. Pin fabric in place. Do the same thing for the top folding it down on the fold line and pin fabric in place.
Remove the pins that were used to mark your fold lines but leave the pins holding your fabric in place.
Stitch a 1/4" seam allowance around all sides of the cover. Remove pins.
Insert that nasty old plastic thing they give you at the bank. They are good for something...they give your checkbook cover stabiity.....
But now doesn't this look so much better?! You can make one for winter, spring, summer, fall, 4th of July, Christmas, Halloween....and it's so easy!!