L.A.
These are photos from the Houston Ball last year. I loved that it was called "True Grit"
http://www.cattlebaronsball.org/2013-event-photos/
And No you do not need boots. It is the Jewelry and or accessories (belt) you should consider. Maybe even borrow some of the pieces.
Here is OK's Ball http://distinctlyoklahoma.com/sociallyseen/cattlebaronsball/