From the Edison Concours d’Elegance:

Concours d’Elegance (properly pronounced kon-koor del-i-gahns) events began over 100 years ago in the parks of Paris, the Riviera and other elegant towns of Europe. The rich and famous of European society gathered to socialize and celebrate, as unique forms of art, the latest automobiles as well as the latest of women’s fashion and design.

These gatherings were called Concours d’Elegance, which term conjures up romantic visions of beautiful women in haute couture in a park like setting surrounded by sparkling automobiles. The early Concours were leisurely social affairs, where lighthearted competitors were rewarded with rosettes. However, man being the perpetual competitor, these events became more defined as time went on.Trained judges examine each vehicle thoroughly and in its entirety. They rate each and every component. Only those vehicles that are perfect examples are judged as Concours quality, and are considered eligible for a class trophy.

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Note added at 1 day 6 hrs (2021-06-29 14:46:05 GMT)
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Also, further down, in the same piece:

Dr. Cy Conrad, Chief Judge, La Jolla Concours d’Elegance:

According to Webster, “Concours” comes from the French, and means “a crowd or confluence of things; also a park promenade.” The term conjures up romantic visions of beautiful women in haute couture in a park-like setting surrounded by sparkling coaches, glistening groomed horses, gorgeous flowers, champagne, fine art and sculpture, and later, by the finest automotive art.

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Note added at 1 day 6 hrs (2021-06-29 14:49:37 GMT)
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It continues:
Man, being the perpetual competitor, has generally sought to triumph. Civilized chivalry, combined with grandeur, became the prevailing spirit of the Concours d’Elegance. Originating in the late 17th century, the early Concours was a leisurely social affair where light-hearted competitions among coaches and fashions were rewarded with rosettes, wine and champagne. As coaches and carriages segued into automobiles in the late 19th century, the competitions became more defined. By the mid 1920s, no society season on the French Riviera was complete without a variety of organized Concours events.

As the romance of the Roaring 20s and the refined elegance of the 30s gave way to the perils of world war, we find the demise of the Concours as it gave way to the bare survival of nations. Once the free world was able to right itself and move beyond subsistence, it was the troika of visionaries Jules Huemann, Reverend Paul Woudenberg and Loren Tryon who in 1950 created what was to become the grandfather of all post-war Concours—Pebble Beach.

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Note added at 2 days 14 hrs (2021-06-30 22:51:25 GMT)
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Am suggesting that in couture terms it's a bit like what to wear to Ascot (i.e an event in the calendar) which e.g. is featured in Harper's Bazaar here https://www.harpersbazaar.com/uk/fashion/g36728518/best-dres...
cf. re Ascot Dresses also this Google Search link https://bit.ly/363EDpX