SONNET: crazycatlady & ? can you tell me

Hi! Crazycatlady, I just saw the pic of your Sonnet on your blog. (did you ever close the neck up a bit?)
I’m wondering, she doesn’t say anything about needles. Do I have to use a circular? I’ve looked 2 or 3 times but I don’t notice any reference to straight or circulars.

I’m thinking of doing this in Arauncania Nature Cotton, kind of thick and thin cotton, works up well in size 8 or 9 needle. Thanks for your help…