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DIY Cardboard Knight Costume: 60-Min Cardboard Build

DIY cardboard knight costume built from large cardboard boxes, silver acrylic paint, and foam brush or paintbrush
AI-generated concept photo

Time60 minEffortMediumSteps14

⏱️ We timed it, but results may vary.

Plan this costume →No signup · 2 minutes.

Silver-painted cardboard armor and a pool-noodle sword. The armor shines, the sword is soft enough for actual duels. About sixty minutes, a medium build: large cardboard boxes, silver acrylic paint, and a foam brush. Score the cardboard before folding so the armor bends instead of cracking.

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Foam brushSilver acrylic paintpool noodleGray tape
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Tip: tape a red crepe-paper plume to the helmet top.

Steps

  1. Safety: An adult should handle the heavy cutting. Cut generous eye holes in the helmet so vision stays clear. (CPSC Halloween safety tips)
  2. Draw every piece on the cardboard before cutting: chest plate, back plate, shoulders, helmet.
  3. Cut the helmet eye holes wide. Cardboard cannot be added back.
  4. A knight who cannot see is a hazard.
  5. Cut all the pieces.
  6. Paint every armor piece silver.
  7. Let the paint dry fully.
  8. Add rivet dots and edge lines with the black marker.
  9. Tape the plates together so they hinge at the shoulders.
  10. Wrap the pool noodle in gray duct tape for the sword.
  11. Safety: Swing the noodle sword in open space only. Never swing it at faces.
  12. Put the armor on over dark clothes.
  13. Carry the noodle sword.
  14. Optional pro finish: tape a red crepe-paper plume to the helmet top.

What next?

Start this costume in the plannerSave it, check what you already own, and get the steps by email.

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Common questions

How do you keep cardboard armor from falling apart?

Gray duct tape hinges at the shoulders and sides, tape both sides of each joint. The tape is the armor's skeleton; the cardboard is just the skin.

What is the safest sword option?

A pool noodle wrapped in gray duct tape. It looks metallic in photos and cannot hurt anyone. Never use wood or real metal, even blunted.

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