Links:
[1] https://www.plymouthyarn.com/sites/default/files/Happy%20Feet%20Beanie%20F223.pdf
[2] https://www.plymouthyarn.com/pattern-type/accessories
[3] https://www.plymouthyarn.com/collection/plymouth-brand
[4] https://www.plymouthyarn.com/free-patterns/yes
[5] https://www.plymouthyarn.com/pattern-errata/no