Pattern does not specify any particular yarn, but simply calls for “Sport weight cotton yarn”.

Main Color (MC): (9-10)(11-11-12) oz, (260-280)(310-310-340) gr, and
5 Contrasting Colors (CC): 2 oz, (60 gr) each.

Other Materials
2 Stitch holders
Yarn Needle
Optional: Elastic Thread

This pattern has a honeycomb pattern on the yoke and sleeves. The pattern photo here shows a modification where the honeycomb pattern is carried throughout.