Colors from cascade 220 sport. I used for this hat.
Black (used in braid)
Ruby ( used in braid and flowers in band)
White (band)
Fuchsia ( used in band )
Silver grey
Charcoal grey

This hat has no ribbing. So it does not have a lot of stretch in it. My gauge for the band is 10 stitch repeat was 1.5 inches by 2 1/4 inch high.
If you need a larger hat size you could go up a needle size or jump to dk wt yarn and needle size. Since this hat is all done in charted motifs it can not have added stitches to increase size.
The pattern gives a picture tutorial on how to do a braid.