I suggest you make from old T-shirts for girls summer hat. Master class how to make flowers from tissue look under the cut) If the cap looks very colorful, you can sew it monotonous.
With the meter ribbon take your measurements
According take your measurements cut a rectangle out of an old T-shirt. The top edge to round
Stitch
Prepare strips frills
Gathered on the typewriter
Sew ruffles to cap
Flower cut circles of fabric
Folded in half circle, mark the middle
Hot glue to glue