The Delphos gown was a finely pleated silk dress first created in about 1907 by Mariano Fortuny y Madrazo (1871–1949) and made until about 1950. It was inspired by, and named after, a classical Greek statue, the Charioteer of Delphi. Since the 1970s these gowns have been desirable and collectable pieces of vintage clothing, with one selling for a world record price of $10,000 in December 2001.
Working out of a 13th-century Venetian palazzo, Fortuny, a Spanish-born artist turned textile designer, produced garments that the novelist Marcel Proust declared "faithfully antique but markedly original". The "Delphos" was a deliberate reference to the chiton of ancient Greece and meant to be worn without undergarments, since the chiton was itself a form of underwear, a radical suggestion during the early years of the 20th century.
Fortuny became famous for his pleated dresses, the "Delphos" and the related "Peplos". The exact method of pleating was a closely guarded secret involving heat, pressure and ceramic rods, which has never been replicated. On both types of dresses, glass Murano beads are strung on a silk cord along each side seam. The beads serve a functional purpose as well as being decorative, as they weigh down the lightweight silk of the garment to ensure a smooth fit enhancing the natural, uncorseted human form beneath. The construction of the Delphos became its own decoration. Although the "Delphos" eventually became formal wear, with Lauren Bacall wearing a vintage red Delphos to the 1978 Oscars, it was originally intended as informal clothing or a tea gown for wearing solely in the privacy of the home.
Delphos gowns were imported into Paris by the couturier Paul Poiret, and the fashion house Babani which sold them to actresses such as Eleonora Duse.
Fortuny's garments, particularly the Delphos gown, have been valued for their artistic and aesthetic qualities since their creation. The fashion historian and writer Colin McDowell considers Fortuny one of the creators of fashion as art, and a Delphos gown was one of only two garments contained in the collection of the Museum of Modern Art, New York in 2003.