Take a bandanna cut in half on the diagonal. Set aside one half to tie as a due rag. Take the other half and measure (or guesstimate) 3 inches from the raw edge and cut again to create a belt.
Take some cardboard, draw a sword shape and cut it out. There ya go! Done! And what did you win? A free Chick-Fil-A kids meal! And a happy goofy kid!