As it’s a recipe, you can use the yarn you want, and the hook according to that yarn.
I’ve used 2, 2.5 or 3mm hook, with think 100% cotton yarn.

ALL MY DESIGNS ARE ONLY FOR PERSONAL USE
Please, don’t sell the things you knit/crochet from my patterns/designs.
Don’t reproduce the patterns in other blogs or webs, and don’t translate them without permission.
Contact me at: mirincondemariposas@hotmail.com