This cute and swashbuckling pirate skull and crossbones hat knitting pattern is super easy and created with duplicate stitch for knitting! This fun Halloween Hat knitting pattern can be part of a pirate costume or worn all year round. First you knit a basic black hat in the round, then use duplicate stitch embroidery with white yarn to easily create the skull and crossbones pattern! Arrrr, matey! This pattern requires knowledge of duplicate stitch and is knitin the round.