I'm working on this pattern too (in the round on DPNs) but I cast on too many stitches -- I'm thinking I made a mistake in calculating the number to CO since I was mentally converting inches to cm and talking to another mom at the same time.
I had DD try it on last night and it was much too big! I'm going to frog it, remeasure her, and try again. (I was only about half-way through one.)
This really doesn't have anything to do with your original post, except to let you know you're not the only one struggling with this "easy" pattern.
It is easy to knit -- just figuring out how many stitches to start with is the hard part!