I wear hankerchiefs a lot! At least a few days a week. They keep my hair out of my face and keep certian little hands from pulling the little hairs at the back of my neck quite so bad. :o)
So my tip for today is on tying the kerchief. Whenever I knot one on, the knot at the back of my neck often gives me a head ache. (I get frequent tension headaches.) And if at any point in the day I need to tighten the knot, it is a real pain.
So my solution is to instead tie it with a rubber hair tie or small rubber band. Pull the kerchief tight on your head and then twist it around the two tails till tight. Slip on your head and then if at any point during the day it needs tightened, simply pull gently on the two tails (much like you would to tighten a pony tail.)
This keeps it tight without having the big bump/knot at the base of the neck.