The Starburst Swirl Hat is a fun variation of a traditional hat, with a few eyelets and changes in the decreases to emphasize the swirls. It can be made as a beanie or slouchy.

Size
Small, 15 – 22 in (38 – 56 cm) circumference, 8.5 in (22.5 cm) tall
Medium, 18 – 28 in (46 – 71 cm) circumference, 9 in (23 cm) tall
Large slouchy, 20 – 28 in (51 – 71 cm) circumference, 10.5 in (26.5 cm) tall
The size can be adjusted up or down by adding or subtracting repeats (8 st) or rounds (2 rounds), or by using different sized yarn and needles.

Gauge
7 st and 9 rows in 2 in (5 cm) of stockinette
Bulky yarns vary a lot in size and stretchability. Please pick the number of stitches to cast on according to your own gauge and size planned.

Materials
bulky weight yarn, small: 90 yd (83 m), medium: 110 yd (100 m), large slouchy: 140 yd (130 m)
needles size 6 and 9 (4 and 5.5 mm), or the size you need to achieve your gauge,

I used Estambres Karina Tamatz for the prototype hat.
Knit in the style you prefer (I used small circulars and DPNs)
markers, 9 - 15
scissors
yarn needle

This pattern was tested. Thanks to the testers bookworm33329, Laur290121, toshi, thesilversparrow and Keibopll.

Stitches
knit, purl, knit 2 stitches together, ssk (slip slip knit 2 together), yarn over