Really more of an evening project I guess. Didn't turn out quite as perfect as I was hoping, but good enough to wear. The fabric is what makes it work - the shell is vintage wool serge from a pair of WWII-era trousers, and the lining is from a WWII vintage wool blanket.
I have enough of the wool serge to make one more hat, if I can find the time to do it. If a new one fits me better then this one may be up for sale.