This how-to crochet video offers a simple pattern and instruction for stitching your own cute and easy crocheted hat. Knitted hats don't have to be for winter. While a cozy hat will protect you from the cold, a lighter yarn can add some style in warmer months as well. Check out this video d.i.y. arts and crafts lesson and learn how to crochet your own knot stitch cover for a ball cap.