It is easy to pick up a knight's costume from a local retailer or any one of several online costumers, which sell a variety of mass-produced knight's costumes ranging from thirty to over a hundred dollars in cost. Authentic replica costumes available through specialty shops will cost you even more. An authentic replica of a chain mail shirt will run you over 300 dollars, while a pair of steel greaves costs $82. Online costume shops also sell those crucial knightly accessories, such as shields, swords, gauntlets and helmets. Or you can buy a couple of rolls of Duct Tape, scrounge up a large rectangle of fabric and make your own distinctive knight's costume for under ten dollars.If you are making a knight's costume for a child, you will want to buy a large jug of milk before you start. An empty clean milk jug with the cap end cut off and covered in silver duct tape makes a perfect helmet for a smaller child. You will probably want to do a little research and find out exactly what a surcoatis before you select your fabric. There are very minimal sewing skills required for making a simple surcoat. Choose an emblem to either draw on the front of the fabric with an indelible marking pen, or you can sew an emblem cut out of fabric or card stock to the front and back of the surcoat. Every knight had his personal insignia displayed on his surcoat for ease of identification, much like sports team players today have their names and numbers on their uniforms.If you are creating a knight's costume for a child, an old pair of jogging pants with the lower legs sheathed in silver duct tape, a milk jug helmet, a sword and shield made from cardboard covered in either duct tape or shiny aluminum foil, and a bright sash to fasten around the waist of the unique surcoat you created for your little knight will result in as realistic a picture as you could find in any costume shop.