A size S sweater has a bust circumference of 105 cm [41¼ inches] which in the given example would give you 15 cm [6 inches] of positive ease

Backwards loop method:

Double-pointed needles: 3 mm [US2½] needles

Patentstrik:

September Hue LANGUAGE:Polski A size S sweater hasThe September Hat is worked in the round from the bottom up on a circular needle in brioche stitch. The stitches are cast on using the Italian cast on technique to create a nice and neat edge. The top of the hat is shaped with decreases. Please note that working brioche stitch in the round on a circular needle means that the brioche stitches are knitted on every other round and purled on every other round. Sizes: Fits head circumference of 53 55 (55