What's interesting is that the original Confederate flag, known as the stars and bars , is almost unknown today.
The flag, as you can see is based on the Austrian flag. Why, I don't know as the creator was Prussian. The Confederacy also adopted the grey uniforms of the Austro-Hungarian Empire.
The design was chosen because it resembled the Stars and Stripes which was still viewed with respect by many in the Confederacy. Unfortunately it looked too like it during battle so the Confederacy adopted a battle flag which is where the current "confederate flag" comes from - sort of, because the modern version differs from that flag too.