You’ll need a small amount of yarn and a crochet hook in the corresponding recommended size.
I used approximately 5.5 m / 6 yd of Light Worsted/ DK weight yarn and a 5.00mm / US H crochet hook. I used ​CotLin​ by WeCrochet (Knit Picks).

This pattern is available in both US and UK terms, in separate downloadable files.