There was a BBC production in the 1960s narrated by Michael Redgrave (I think, I am going on information given by a friend) that was called "The Fantastic War". I have been watching it on YouTube.
It is about WWI.
It went into far greater detail than Hew Strachen's "The First World War" which aired a few years ago on the history channel.
Anyway, in episode 4 of
"The Fantastic War", "The Schlieffen Plan", at time index 6.47, there is a scene where the narrator says the Kaiser is ridding with the Crown Prince's Regiment, the Death's Head Hussars.
The uniform they are wear is almost identical to the ones above.
I just love these kinds of discussions...

I don't mean to be a know-it-all, but I have been doing a lot of reading on the subject due to my interest in WWI aviation.
This is fueled by the WWI flight simulator
: Rise of Flight. A really awesome simulator.
Richard