Not sure if this will help, but I know Tandy has a pattern for a leather tricorn hat that you could modify. Actually Capn_Jack_Savvy has a really good tutorial here
The Tricorn is much different... there are many Tricorn tutorials out there, since you can also use black round wool hats as a basis. But it's hard to find this explixit shape.... (It's a bit like Davy Jones Hat)
The hat would have to be shaped and stiffener added.
It is shaped almost like a large front tricorn but most likely a bicorn as Apollo mentioned.
Take a look at the PotC ride Auctioneers hat as an example.
Nearly finished the hat today. I‘m pretty happy with the result. These oval ornaments still need some bronze touch-up, but the overall look is what I have imagined.