See how I transformed this old rat into a most delightful hat...

From the outset I mentally divided the Mayor's construction into thirds: his head, his hat, and his body. Keeping this outlook, I can now say that I am two-thirds through the costume. Perhaps that is taking liberties given the proportionality of work between the hat and the body, but I'm going with it. The hat itself took longer than I expected it to, but I am content with the result.