Here are a few pictures of prominent Belgians wearing swords, these pictures are copied from "La Belgique et la guerre" and probably correspond to the end of the 19th, or beginning of the 20th century.
Military : Infantry
Military : Cavalry
Military : Cyclists
And a beautiful series of pictures of ministers (some with a military background) from "Le parti catholique belge et son oeuvre : 25 années de gouvernement 1884-1909".