Yarn packs available from the designer here.

In addition to the colorized main chart, which includes line-by-line color references, the pattern has a colorized layout for each size, showing you exactly how the colors line up with the decreases for each size.

You’ll need two different-size needles, one smaller needle for the ribbing, one larger needle for the main / stranded portion.

Here are the pattern’s suggestions (but, as always, use whatever size you need to achieve the correct gauge):

Ribbing: If you knit loosely, US #1 1/2 / 2.50mm, or…
If you knit tightly, US #2 / 2.75mm

Main: If you knit loosely, US #2 1/2 / 3.00mm, or…
If you knit tightly, US #3 / 3.25mm

In addition to the colorized main chart, which includes line-by-line color references, the pattern has a colorized layout for each size, showing you exactly how the colors line up with the decreases for each size.