According to the Reuters:

The dress that sold for $144,000 was described by the auction house as a black crepe evening gown that Diana wore during a state visit in 1992.

The princess wore the second dress, which is silk chiffon and strapless, to the Cannes Film Festival in 1987 as well as in a portrait sitting that year and to a 1989 performance of "Miss Saigon" at Theater Royal in London.

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