First I start with the scarf off of my neck, underside up. I then pleat fold two opposing corners. See the illustrations below. The pleat folding does not have to be exact in fact it should not be, as this is what gives the billowy look to the scarf while wearing.
Now you are going to grasp the scarf in the very center keeping the pleated area bunched, and place the scarf on your neck. It is a good idea to pull it down in front kind of taunt in order to hold the pleating or bunching in place at the back of your neck.
With the front points hanging down, pull out from the center edge two little "tugs" of the scarf edge. You will be tying these together in a knot.
Once you have the little pieces "tugged" out, loop right over left and pull up slowly and tightly in place below your chin.
Now you will have some lovely billowy poofs that you can either arrange and let hang softly at your neck or off to the side, as I did with the Les Merveilles de La Vapuer below.
Or you can follow through with a full know of the tugged out areas which provides the final look of the Chevaux de France I am wearing in the picture shown last in this post.