Baby Geometry

While traveling, of course I started another knitting project: the cloyingly-named Heartbreakingly Cute Pilot Cap from the new Mason-Dixon book. It's cleverly knit as a flat piece with zigzagging edges:



By sewing the zigs and zags together along the edge that's on the bottom in this photo, you get something head-shaped. Then you attach i-cord ties.
The original yarn was something subtly shaded in wool. This is Plymouth Dreambaby in, obviously, solid red.

So now I'm wondering if I could use the sewed-up zigzag method for the crown of an adult-sized hat with a ribbed cuff. I think I need to start with paper and scissors...