This is the 1981 royal wedding of María Teresa Mestre y Batista-Falla, a commoner born in Cuba, to blue-blood Henri Albert Gabriel Félix Marie Guillaume. (Their names are so amazing that I had to include them in their entirety.)
They are now the Grand Duchess and Duke of Luxembourg.
Maria’s dress has to be one of the most covered up wedding looks ever, and yet she looks so pretty and elegant.
It's good etiquette to share what you like!