Step 1
Purchase metallic gray pants, tights or sweatpants according to personal preference. Trousers or tight-fitting pants will be most convincing since they are closest to what Sharkboy wears in the film.
Step 2
Buy a black turtleneck to be used as the layer underneath Sharkboy's shield vest.
Step 3
Use a gray or metallic silver utility vest in place of Sharkboy's shield. You can find such a vest at a sports shop or camping supply store.
Step 4
Draw shark teeth in the shape of a shark's open mouth on the front of the vest using a white fabric marker to emulate the design of Sharkboy's shield.
Step 5
Cover thin sheets of cardboard with metallic spray paint. Allow the cardboard to dry overnight.
Step 6
Trace the shape of a shark's fin using a pencil and then cut out the shape using a box cutter. The size of the fin will vary according to the height of the person wearing the costume; measure the fin to reach from the base of the neck to the middle of the back.
Step 7
Attach the fin to the back of the utility vest using a hot glue gun. The fin should stand up on its own once it dries.
Step 8
Finish the costume with a pair of black elbow length gloves.
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