Leisure Arts Messy Bun Hats, Plus! Cabled Brim Hat Crochet ePattern- Need a hair-friendly hat that won't mess your messy bun? This cable brim hat is crocheted with the front post treble crochet stitch using size 4 medium weight yarn and US size I hook. Finished head circumference measures approximately 20 to 22. Easy skill level. 6 pages, PDF download.