Definitely the purple sash of the Order of Leopold.
Prince Laurent did not wear any order. I don't know if he did not receive any German order, of if he received one (then probably the same rank in the German Federal Order of Merit as his sister Archduchess Astrid) and chose not to wear it.
Anyway, his clothing for this State dinner was very... puzzling.
(Picture credit: 1) Robin Utrecht/ABACAPRESS.COM, 2) Olivier Polet/Reporters/ABACA)
I would not like to sound old-fashioned, but I find very strange that Mrs Daniela Schadt is treated with the full protocol treatment of a First Lady. President Gauck is separated, but not divorced, from his wife, Gerhild Gauck (née Radtke), whom he married in 1959, and mother of their four children. Daniela Schadt is Mr Gauck's partner since 2000, but their partnership is just a domestic arrangement, without legal status. Isn't there any reluctance, in Germany or abroad, to see Mrs Schadt being given the status and precedence of a First Lady?