Turn the pillowcase inside out, and cut holes at the opening fold, so a ribbon can be run through. Don't cut through both the inside layer and outside layer of fabric; the holes should only be on the inside-out layer of fabric.
Cut enough ribbon for your dust bag. It should be at least the size of the opening of your pillow.
Tape one end of your ribbon to the end of your stick.
Loop your ribbon through, and remove the stick and tape.
Finally, turn the pillowcase right side out. That's it! You now have a pretty dustbag for your precious designer shoes or bag!