Step 1: Materials needed:
Guitar string: Acoustic strings tend to be more flexible, but thinner electric also works.
20 and 26 gauge wire: I use regular hardware store 20 gauge for bundling the strings at first, then I use a colored copper wire for the finished product.
Various ribbons and a large needle: I used a satin 3/8" ribbon for the choker, and satin1/8" to sew the guitar braid to the 3/8" ribbon.
You will also need a small amount of strong glue, like E-6000.