Add new stitches to your repertoire! The double and half double crochet stitches are great for blankets, hats, scarves and sweaters. Create a mug rug using these two new stitches. Students have the option of bringing in materials for class. If you elect to provide your own materials, please provide approximately 20 yards (0.35 ounces) of worsted (medium/size 4) weight yarn and size US I (5.5 mm) crochet hook.