Classic cabled hat
You can knit this hat as a slouchy beanie, or short beanie.
Yarn: Aran weight wool yarn. 206m (225 yd) for slouchy beanie, 146m (160 yd) for short beanie. Photographed with Cascade Yarns Ecological Wool®
Needles: 3.75mm (US 5) and 4.5mm (US 7) circular needle or double-pointed needles. Adjust needle size if necessary to get gauge. Cable needle and tapestry needle.
Gauge: 17.5 stitches rows in stockinette stitch with bigger needle = in 10 cm (4 inches). If you knit non elastic yarn like cotton or merino wool, you may need smaller needle (= bigger gauge)
Video: Stretchy Cast On (YouTube)