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how to make a rainbow fish costume

Creating a rainbow fish costume can be a fun and colorful project, especially for children’s events or costume parties. Here’s a step-by-step guide on how to make a rainbow fish costume:

Materials You’ll Need:

  1. Blue Bodysuit or Clothing: A blue bodysuit, leotard, or leggings and a long-sleeved shirt to serve as the base of the costume.
  2. Fabric Paints or Fabric Markers: In various colors for creating the rainbow fish’s scales.
  3. Paintbrushes: Various sizes for applying paint.
  4. Cardstock or Craft Foam: To make the fish’s fins and tail.
  5. Scissors: For cutting the fins and tail shapes.
  6. Hot Glue Gun and Glue Sticks: To attach the fins and tail to the costume.
  7. Elastic or Ribbon: To make straps for the fins and tail.
  8. Safety Pins or Sewing Supplies (optional): To secure the elastic or ribbon.
  9. Pencil and Paper: For drawing and planning the fish scales.


  1. Prepare the Base Costume:
    • Put on the blue bodysuit or clothing to serve as the base of the costume. Make sure it fits comfortably.
  2. Plan the Scales:
    • Sketch out the design of the fish scales on a piece of paper. The rainbow fish is known for its colorful, iridescent scales, so plan accordingly.
  3. Paint the Scales:
    • Using fabric paints or markers, paint the scales onto the blue costume. You can create an overlapping pattern, starting with the primary colors (red, orange, yellow, green, blue, and purple) and blending them together to achieve a rainbow effect.
    • Allow the paint to dry completely before proceeding.
  4. Create the Fins and Tail:
    • Cut out fins and a tail from cardstock or craft foam. The rainbow fish has a triangular dorsal fin on its back, pectoral fins on its sides, and a forked tail.
  5. Paint the Fins and Tail:
    • Paint the fins and tail in vibrant, rainbow colors to match the scales on the body. You can use the same fabric paints or markers.
  6. Attach Elastic or Ribbon Straps:
    • Attach elastic or ribbon straps to the fins and tail using hot glue or sewing. Ensure they are long enough to fit comfortably over your shoulders and around your waist.
  7. Secure the Fins and Tail:
    • Wear the base costume and then put on the fish fins by sliding the elastic or ribbon straps over your arms like suspenders. Position the dorsal fin on your back and the pectoral fins on your sides. Secure them in place with safety pins or additional hot glue if needed.
    • Attach the forked tail to the back of the base costume, allowing it to drape down like a fish’s tailfin.
  8. Accessorize (Optional):
    • To enhance the costume, you can add a glittery eye on the fish’s head using fabric paint or a large googly eye. You can also use craft materials to create a fish mouth.
  9. Wear and Enjoy:
    • Put on the complete rainbow fish costume and enjoy your colorful transformation!

This DIY rainbow fish costume allows you to capture the vibrant and playful spirit of this beloved character. Adjust the size and complexity of the costume based on your preferences and the intended wearer’s age.