Start with measurements. Measure your child from the shoulder down to the knees of the child. Double that measurement and cut your colored felt to that length.
Fold in half. The folded side is now the top of your outfit.
Cut out a triangle in the top. This is for your head.
Glue pieces together. Run a stream of fabric or hot glue down the sides to glue the pieces together. Be careful to leave the top unglued. This should be approximately 12 inches so you have arm holes.
Fold inside out. This is so your glue seam is inside.
Cover the hat. Use the remaining colored fabric to cover the birthday party hat.
Now take strip of black fabric. Cut out 2 rectangles the width of the costume. Cut your rectangle in half length wise with a squiggle. Glue them to the top and bottom leaving a space between the cut rectangles so you can see some color showing through.
Cut out a BIG oval. Then glue on the front of the Crayon.
Cut out the Letters C-R-A-Y-O-L-A in the colored felt. Glue them on the black oval.