In my queue to make! However the pattern is not free as stated but I did purchase it and it's super well written and looks easy. Serenity Hooded Scarf - free crochet pattern by Tina Lynn Creations. Sizes child, adult and XL.
Edit: Response has been that the pattern for the large hat is too large - I based this off my husband who only later told me he has an XL helmet size. Overall everyone seems to think that the 78 around is just fine for size.