A simple beanie that works well in a variety of lightweight yarns, especially those rustic woolly ones with a heathered texture similar to tweed suits (handspun in particular). Torx features hexagonal decreases that resemble those funky screwdriver heads that pop up from time to time.

Yarn
Sample shown in Brooklyn Tweed LOFT (100% wool; 251 metres // 275 yards per 50g) in Hayloft;

Sizing
Hat circumference (unstretched): 45 cm // 18 inches;
Edge to crown length: 23 cm // 9.25 inches OR custom;
This hat will comfortably accommodate head sizes 46-52 cm // 18.5-20.75 inches, and may fit smaller or larger heads in some instances. This corresponds roughly to adult small to medium size.

Skills required
Tubular cast-on
Basic stitches (knit, purl)
Decreasing (k2tog, ssk)