How to Make a Shark Fin Hat

Written by donna eigen
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How to Make a Shark Fin Hat
A shark fin signals approaching danger. (Shark hunting for prey image by patrimonio designs from

The sight of a large dorsal fin moving along the ocean's surface can strike fear into the heart of even the bravest soul. The shape signals an approaching shark, one of the world's oldest living species and deadliest predators to ever inhabit the planet. You can make a shark fin hat as part of a Halloween costume or funny fashion accessory with a few simple materials and minimal sewing. When people see this shark fin approaching they will scream with delight.

Skill level:

Things you need

  • 2 squares of grey craft foam, 1 square foot each
  • Scissors
  • Pencil or marker
  • Straight pins
  • Needle and grey thread

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  1. 1

    Layer the two pieces of foam, matching the edges. Draw the fin shape on the foam. The tip of the fin will curve to the back when the hat is on. To make the front curve, draw a curved line from the lower right corner to the upper left corner. Draw another curved line from the lower left corner to the upper left corner for the back of the fin.

  2. 2

    Pin the pieces together inside the line and cut along the lines to make the fin shape. Baste along the curved edges with a long blanket stitch and remove the pins. Leave the bottom open.

  3. 3

    Try on the hat. If it is too big, make the opening smaller at both ends and pin together. Remove the hat and sew the opening where you placed the pins; remove the pins. If the hat is too small, open the bottom of the back seam about 1 to 2 inches to fit the wearer. Reinforce the stitching where the seam begins above the opening.

  4. 4

    Sew the curved sides with a narrow blanket stitch and remove the basting. Reinforce the bottoms of both seams so the stitching won't rip out when the hat is put on.

Tips and warnings

  • Instead of craft foam, use felt, an old wool blanket or other thick material that will hold its shape. Make smaller fin hats for children and babies. Dress the whole family in shark fin hats and go to a party dressed as a school of sharks (although only one species is known to actually swim in schools). Wear an inflatable doughnut, flippers, goggles and a snorkel with your hat, along with a T-shirt that says, "Come on in, the water's fine."

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