Aluminum foil Black elastic or ribbon Cardboard Construction paper Gray pants and sweatshirt Markers Paint Phillips screwdriver Scissors Silver card stock Tape/stapler[1] X Research source

Circlet: take your card stock and draw a crown. You can do this in a traditional style, with the crown coming to elaborate points over the head, but in principle, cut a strip of construction paper wide enough to fit around your head in the shape of a crown. This will form the headband. Wrap the strip of paper around your head to find the appropriate length for your head. Cut and fasten the two ends of your paper together with tape or a stapler. If you have no card stock and no time to get any, a shirt box will work in a pinch. Battle Helmet: use a plate or circular object to help draw a circle on your silver card stock that is bigger than your head for the top piece of your helmet. Add a point to your circle that comes out to one side, making a teardrop shape. This point will be the front of your helmet. Now outline your teardrop shape so there is about an inch in between the two lines. Cut along your outer line, clipping slits in your inch margin between first and second lines. Fold your inch margin down to form tabs to connect the top and bottom pieces. Make the bottom piece by cutting a 10 to 20 inch piece of silver card stock, folding it in half longways, and then cutting a triangle that has its right angle opposite the crease. This will be where the top of your helmet inserts. Along the fold, cut a slit or slits for eye holes, and then fit your tabs into the opening of your bottom piece, stapling, taping, or gluing the two pieces together. [2] X Research source

Small details might not show up under the tin foil, but curving your sword will give it the look of a scimitar. You can cut almost any simple medieval weapon (ax, trident, spear) from cardboard. You can achieve the same metallic effect with some paints. Use metallic paint to give your sword a unique design.

Popular shield designs you might want to consider: the fleur de lis, a roaring lion, a griffin, a castle turret.

Black undergarments can also be worn for more ominous effect.

1 yard elastic 1/2 yard patterned fabric 12-inch pieces red and black felt 2 yards silver ribbon 4 white or metallic scouring pads Black boots Black gloves Black hoodie Cardboard wrapping-paper roll Disposable pie tin Gray long johns Gray nonskid drawer liner or rug pad Large red and black feathers Small metal colander Small roll canvas-backed foil insulation (available at hardware stores)[4] X Research source

Dress up the edges of your tunic with silver ribbon, or take drawer liner to give your tunic the appearance of being chain mail.

If you have a sensitive scalp or the colander is uncomfortable, it may help to attach an elastic chinstrap or wearing a hat underneath the colander for padding.