First, take a yellow felt and cut a rectangle of measurement 7.5 cm x 5 cm.
Fold the short sides of the felt rectangle inward, to meet at the middle. Glue the end pieces in place, at the joint. Allow it to dry fully.
Using your fingers, pinch the rectangle in the middle, to cinch it in. Add glue into the folds to hold the cinched middle in place. Then turn the bow over and add glue in the middle of the front side. Allow to completely dry.
Cut a small strip of felt for the crossover piece. This can be in the exact same color, or a contrasting color, whichever you prefer.
Wrap the small strip of felt around the middle of the bow, to cover the joint. The joint of the strip must meet at the back so that it won't be seen. Glue the strip into place and allow it to dry. To complete glue to the hair clip or slide, with the back facing onto the hair clip.