Head'n Home Homemade Hats: Watsonville-based Head'n Home does not really make hats. They make works of art in leather that happen to be shaped like custom-fit hats. Their work is expensive (although not prohibitively so), and their styles are not for everyone. But they are wonderful.
San Diego Hat Company: Carlsbad-based SDHC makes a wide variety of inexpensive, very serviceable hats.