Gauge is very approximate.There is 5 different Stitches (designs) used
I designed it to fit sizes medium to large. It fits small, but a little more lose. There is a direction in the pattern on how to make it longer. You can make it smaller using smaller hook. I would not recommend a bigger hook, since it will change the form and fit.
I recommend one button .
There is a project group All My Needle Craft (Blustery Harvest) on FB designated to this project. I will be available to help you through the project and answer questions you may have