In the army museum of Vienna I bought ages ago, a post card with the photo of the original coat of FML von Koller, on the back it was printed that this coat was worn on Napoleon's travel to the ship which brought him to Elba.
Also a good read - maybe Steve can find a digital copy
Napoleon Buonapartes Reise von Fontainebleau nach Frejus
Herausgegeben don dem zur Begleitung Nap. Buonapartes allerhöchst ernannten Königl. Preußischen Commissarius Grafen von Truchses - Waldburg, Königlich Preuß. Obristen
Berlin 1815 in der Mauerschen Buchhandlung
Fans of Roberts and Napoléon - don't read.
Even an ADC of general schuwaloff had to be disguised as Napoléon