Chain mail is one of the oldest forms of body armour. It is traditionally made of metal that is linked together to form various body coverings, from tunics to hoods. This type of hood would be heavy and uncomfortable for a child. There is a way to sew a chain mail hood from fabric that looks close to the real thing. The supplies needed for this project are available at most fabric and craft stores.
Measure from the child's forehead down to the top of the chest, just below the collar bones. This is where the hood will reach to. If you want it longer than this, measure to the desired area.
Fold the fabric in half, with the right sides together. Make a mark on the folded edge using the previously determined measurement. Make another mark on the other edge of the fabric where the two layers meet.
Connect the two marks with an arc, as if you were making a circle. Cut out along this line. At this point you should have a half circle of fabric.
Hem the curved edge of the fabric up one-quarter of an inch. With right sides together, make a seam on the straight edge of the fabric. This seam only needs to be three inches in length, and is also using a one-quarter-inch seam allowance. Turn the hood right side out.
Place the hood on the child and check for fit. The seam goes under the child's chin, and the folded area is at the top of the head.
If you want the hood to cover more of the neck, you can make the seam longer.