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 minEffortMedium

⏱️ 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.

3 of 7 things covered, counting basics we assume you have.

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Still need:

Silver acrylic paintFoam brushpool noodleGray tape

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Tip: tape a red crepe-paper plume to the helmet top.

Materials

Large cardboard boxes, 2 to 3 (make: collect spares)
Silver acrylic paint, 1 bottle (buy: craft store, tempera paint works too)
Foam brush or paintbrush, 1 wide (own, or buy: craft store)
1 pool noodle (buy: toy store or dollar store)
Gray duct tape, 1 roll (buy: dollar store)
Black marker, 1 (buy: dollar store)
Scissors, 1 pair

Steps

Safety: An adult should handle the heavy cutting. Cut generous eye holes in the helmet so vision stays clear. (CPSC Halloween safety tips)
Draw every piece on the cardboard before cutting: chest plate, back plate, shoulders, helmet.
Cut the helmet eye holes wide. Cardboard cannot be added back.
A knight who cannot see is a hazard.
Cut all the pieces.
Paint every armor piece silver.
Let the paint dry fully.
Add rivet dots and edge lines with the black marker.
Tape the plates together so they hinge at the shoulders.
Wrap the pool noodle in gray duct tape for the sword.
Put the armor on over dark clothes.
Carry the noodle sword.
Optional pro finish: tape a red crepe-paper plume to the helmet top.

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