Cut a headband out of poster board that is slightly larger than your child's head.
Cut a hat shape out of black construction paper.
Cut a strip 1 1/2" wide out of gray construction paper and glue to the hat as shown. Trim the edges off to match the angle of the hat.
Cut a square out of yellow construction paper that is 2 1/2" X 2 1/2" inches. Cut the center out of the square and discard. Glue the remainder of the square over the gray strip.
Glue or tape the finished hat to the headband.
Tape the headband to fit around the child's head and trim off any excess poster board.