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 ...
The Queen even learned to crochet herself, making eight crocheted scarves as awards for selected veterans of the South African War. These Royal scarves were worn as sashes with great pride.