I've spent most of my free time for the past two days cutting up manila file folders, taping them back together, and putting them on my head in an effort to make a serviceable hat pattern. I’ve been using my basic hatmaking book and many fashion plates as references, but I just cannot make the thing look right.
Here’s the hat in my inspiration painting. It has a high, turned-up brim with an odd shape and seems to be set back on the head.

I can’t say I am all that fond of it, but I think if the brim didn’t have that weird curve, I’d like it better, and it would still have a similar feel.
Here are two plates that are quite similar to the painting, brim-wise.
( some fashion plate hats )Here are some that have a different shape, but still have the brim turned up in front.
( some more fashion plates )Those last 3 don't quite match brim-wise, but they have lower crowns, which seem to match the painting better.
The problems are, again, Impressionism making things look all wacky, and not being able to see the back in the painting or any of the plates. I am thinking of just calling the hat-drafting thing quits and buying a pattern. Specifically, the
Truly Victorian French Bonnet. But 1885 is a little late for what I'm planning; the painting is dated 1883 and I'm thinking the style she's wearing is more 1881-2.
So I also looked for a readymade buckram frame to cover. I didn't find any that looked like I wanted, but I did find
this straw hat for sale, which has a brim that doesn't go all the way around in back, a detail I might be able to incorporate into drafting my own hat (again).
I've also been planning F's hat. She is technically a bit young for these, being not quite 2 yet, but oh well.
( little girl hats )I could try to find a tiny straw boater, but that seems unlikely. I think I could sew any of the other 3 in fabric by adapting a modern pattern I already have.