Hatternique Hat Size Chart Hatternique Hat Size Chart This handy chart may assist you in comparing American hat sizes with real mesasurements. Knitting/Crochet Instructions Craft Yarn Council of America This site offers instruction for knitters and crocheters, alike. Knittinghelp.com Scores of topics are covered providing basic assistance by watching video demonstration. Crochet Guild of America Left- and right-handed crochet instructions. Stitchguide.com Learn all the knitting and crochet stitches you see in all the magazines, listed by stitch.