A classic costume that often goes overlooked is the mighty shark. Whether the costume is for a little kid or an adult, most people will smile when they see someone show up in a shark costume on Halloween night.
The most important feature of a shark costume is its fin. In fact, for a really quick shark costume, all you'll need to create is a fin. You can do this by using foam rubber, a couple of cloth belts, gray spray paint, and a little bit of sewing. Simply cut a fin shape out of the foam rubber. Put the two cloth belts on the costume wearer.
The top one should be placed at the widest part of their chest. For women, this means just below the breasts Attach the second one across the top part of the stomach. Use safety pins to place the fin on the back of the straps. Remove the costume, sew the fin in place, and remove the safety pins. Spray paint the entire apparatus gray and your shark fin is ready to go. This costume works even better when paired with gray clothing such as a gray long-sleeved shirt and gray sweatpants.
For a slightly more detailed shark costume, you'll need a hot glue gun, a gray sweatshirt, and a few pieces of very stiff felt. Specifically, you'll need a few sheets of white felt, one sheet of black felt, and two fairly large sheets of gray felt.
The hood of your gray hoodie is going to be your shark's head. On either side of it, glue two small circles of black felt for the shark's eyes. Next, cut out triangles of white felt, these will be your shark's teeth. The teeth will be glued all along the inner edge of the hood so that they stick out like teeth.
Now that we have the shark's head perfected, it needs a fin. Using the gray felt, cut out two identical pieces of fin-shaped material. Glue them together, leaving a few unglued inches at the bottom of the fin (where it will attach to the hoodie).
These two bits of unglued fin material will be spread to either side so that when you glue the fin to the back of the hoodie, it will be held relatively upright. Complete this final task and your gray hoodie has been turned into a frightening (well maybe not so frightening) shark. Have fun!