Some archeology...
This is the only, and therefore unfortunately also the best image I have of Isabell Nitzl, a young then 20-year-old German lass who used to ride horses naked in central Germany for several years around 2007 and was subject of several German lifestyle reports, for example
this one and
this one
I suspect Michael Zauels is the only one who could possibly have more and better photos of her.
Just maybe, bugaloo too?