Use the Tunisian “knit” stitch. A good tutorial can be found here. Row 1: ch 15 for a narrow scarf, or 42 for wider “movie” size. Insert the hook into the 2nd ch from hook, yo, and pull ...

This scarf is a classic. It’s almost an exact replica of the ones the characters wear in the films, and it’s one of the basic pieces of Harry Potter memorabilia every fan should own.