My first Ravelry pattern is up! There are two versions, with or without brim.

For Rowan Cocoon version, use 7 mm needles.
Gauge 13.5 stitches per 4” in 1-by-1 rib, slightly stretched.

For Noro Iro version, use 9 mm and 7 mm needles. The latter is required for the brim section only.
Gauge 11.25 stitches per 4” in 1-by-1 rib, slightly stretched.