I see that after the Great War, General Melchett skipped across the pond and took up a new profession.

It would offer a little bit of armour. Steel boning has supposedly stopped bullets in the past.

Depending on the design and length it might not even be that restrictive to movement.

Hard to say with only a small portion shown… If it was tight laced then the laces would be touching without gaps in the back so I’m assuming it’s on snug but not unreasonably tight. Too loose and it’ll twist around and be offset if you do anything.

It’s also really dependent on corset design. There’s ones for sports/physical activity that have cupped ribs so your lungs can expand without restriction, with the way it is sewn lending more to core support rather than prioritizing silhouette.

There’s corsets specific to horseback riding as well that would fit the theme of cowgirl. They allow for the flexibility required to mount/dismount a horse whilst also supporting proper posture so you’re not jostling your spine around poorly.

The hat covers too much of the body for me to be able to tell really.

https://en.wikipedia.org/wiki/Handkerchief_code?wprov=sfla1

I'd never heard of such a thing, very interesting