Three brothers, three kings - portraits of Louis XVI, Louis XVIII, and Charles X

Dressed in the robes of the Ordre du Saint-Esprit.

Louis XVI, by Alexander Roslin, 1782.

The comte de Provence, the future Louis XVIII, by Antoine-François Callet, 1788. (The crown and regalia must have been added after he became king.)

The comte d'Artois, the future Charles X, by Antoine-François Callet, 1779.

And in their coronation robes; Louis XVIII chose to forgo a public coronation ceremony.

Louis XVI, by Antoine-François Callet, 1779.

Louis XVIII, by Robert Lefèvre, circa 1822.

Charles X, by François Gérard, 1825.

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And now for something a bit more realistic: a sketch for a coronation portrait of Louis XVIII by Antoine-François Callet, circa 1814 or later.