Things you will need:
33"-42" of nice Material (depends on neck size)
Rotary cutting wheel
Sewing Machine with thread
Bow tie template, printed on paper or acrylic
Grab a cloth tape measure and wrap it around your neck. It should be in the 15"-23" range, give or take a few. You will use this to make a bow tie that is custom fit to your own neck. This is a picture of Drake getting his neck measured.