I got all the way to the end of the Turbine hat, and had BF try it on before I actually finished it and cut any yarn, and it was way too small. So that's frogged, and awaiting a new plan.
Coincidentally, he realized that while he doesn't always love the stretchiness of the knit hat I'd made him a couple of winter ago, he does like how warm it is. And since I made them in exactly the yarn (Malabrigo Rios), he has a good demo of how pattern actually does effect the warmth of the fabric. So it looks like I'll be making a very orange Jaques Costeau hat. But that'll be waiting just a bit - I really cruised along on the Honey Cowl, so I think I'll finish that before casting on something new.