Agony! I worked so cautiously on this project. Before I started, I read through the pattern multiple times. I checked my gauge about five or six times, double-checking that I was doing it right by taking it in to the yarn shop nearby. I followed the chart PERFECTLY. This is the first (and so far only) project I have ever done where I did not make a SINGLE mistake the entire time. Even when my row marker fell off and I didn't notice for some time, I was able to identify where it was supposed to go and didn't get thrown off at all.
I think I first started wondering if I'd messed up when I was nearing completion and I hadn't even started using the second skein of yarn it told me I would need.
Of course, once I finished it, it dawned on me what was wrong: the hat was much too small!!!
Ugh... So I'm either going to force myself to wear a too-small-hat this winter, or I'm going to sell it, which I REALLLY don't want to do because i love this hat so much. But until I figure out where the hell I went wrong, I won't be doing another one. It exhausted me, and having it turn out wrong just put me off.
Attached: a detail picture of the closed cable and a picture of me wearing the hat so you can see the size