The Costume Museum of Canada has a bonnet dated at 1890 that makes me think of pioneer style bonnets. To my thinking, that seems like an odd date for this style of bonnet. If the dating is correct, I can only imagine that it wasn’t intended as a fashionable kind of item but more of a practical thing for gardening or doing heavy, dirty work. I can also imagine an older woman wearing it because that is what they wore back in her day.
This is where you can see the pieces (brim, side, back and neck) and where the cording should be.
You can see the gathering and tucking that forms the neck piece and that helps with the fitting.
If I ever get around to making work style garments, I think this hat would be a nice one to work on while watching TV!