One skein is enough for any of the sizes.

If you have some green yarn on hand, you can try holding two strands of any worsted together.

If you want to knit the hat with two strands of worsted, you just go up one size on the pattern.

My email address is on the pattern (and on all my patterns) so you can contact me with questions as you are working the pattern. I love to send links to online videos to demonstrate particular skills.

If you want to stage a photo like this, be sure to line the pumpkin with a big garbage bag, and add towels for baby to sit on.

Happy Autumn!!