Quilted Ukulele Case Tutorial | by Mommy By Day...Crafter By Night | For Fabricworm
So calculate your measurements for the length and thickness of panels you will need. Then cut out 2 in your main fabric, 2 in duck cloth, and two in batting (but still cut your batting down a half inch smaller on all sides to reduce bulk). Layer them as you did the previous panels and quilt as desired.
Place your zipper face down on the right side of one of your panels and pin in place. Use your zipper foot and stitch. Open up and place your other side of your zipper face down on the ride side of the other panel and stitch.
Start by measuring around the edge of one of your main panels- use a soft measuring tape so you can get an exact measurement. My perimeter was 56 inches.