Age/size bands are for guidance only: choose a size approx. 2-5 cm (1-2 in) less than your actual head circumference for a snug fit. Patterns contains further information on length and adjusting for length.
Finished hat circumference above the brim
Age approx. 8 -adult small: 48cm/19in circ.
Adult medium: 52cm/20½in circ.
Adult Large: 56 cm/22in circ.
Note that the brim has some positive ease.
Knitting in the round
Increasing and decreasing
Tapestry needle to weave in yarns
6 Stitch markers to mark increases
A button (optional)
Yarn & yardage
Chunky weight yarn. I used Rowan Cocoon 80% merino, 20% mohair, one skein each in Kiwi (green, MC) and Clay (beige CC).
Age 8-adult small: 100m/110yds (50m/55yds of each colour)
Adult medium: 120m/130yds (60m/65yds of each colour)
Adult large: 130m/140yds (65m/70yds of each colour)
Always allow some extra yarn. If you change the suggested yarn or use yarns of different weights you may need to allow greater yardage.
full written instructions and a chart for the brim decreases.
Links to tutorials for cast on method
link to tutorial for concept of knit-on brim/border