You can't call your Link Halloween costume complete unless you are toting around the Legend of Zelda Hylian Shield. This shield was created by Etsy merchant Aradani and is a near-replica of the Hylian Shield featured in Nintendo's famous gaming franchise.
I saw "near-replica" as I don't think that this shield could withstand actual blows from a sword or fire from a dragon. This shield was handmade by Aradani and stands an impressive 24 inches high and 18 inches wide. Aradani has skillfully repainted the front of the shield to with the Triforce and the symbol of Hyrule in case any geeks try to call you out on your costumes lack of detail. If you truly want to pull your Link costume together you can pick up the Legend of Zelda Hylian Shield for a mere $400. Money well spent.