Part your hair in two. For a less strict effect, trace the parting in the middle with your fingers and not with a comb. Twist the two locks then tie a knot above the head.
Hide the ends of the locks behind the knot.
Secure the comb and "secure" the hairstyle with bobby pins and hairspray if some strands tend to escape.
Find the large combs of Clémence Cabanes on her eshop.