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French designer Yves Saint Laurent pioneered “cross-design” in fashion, taking inspiration from street trends to modernize haute couture.

Saint Laurent was the first to launch a ready-to-wear label, YSL Rive Gauche Prêt-à-Porter. He was the first couturier to open boutiques for both men and women. Using traditional menswear fabrics and designs for women, Saint Laurent also literally cross-dressed, giving men and women alike chic pant suits, elegant tuxedo jackets and urban safari gear.

By blurring gender-specific design, Saint Laurent empowered individual style while creating a scissor-sharp fashion aesthetic of sensual ease and beauty. Many of his designs are today considered timeless classics. Saint Laurent also consistently used Black models, like Mounia, Iman and Naomi Campbell, and he drew endless inspiration from different ethnicities and cultures, in no small part because of his Algerian roots.

Born to French parents in Oran, Algeria, in 1936, Saint Laurent went to Paris at age 17 to study fashion at the Chambre Syndicale de la Haute Couture. Just two years later, in 1955, his remarkable sketches were shown to Christian Dior, then the world’s reigning couturier, who hired him immediately.

Surprisingly soon thereafter, Dior publicly chose Saint Laurent as his successor, which sadly proved prescient when the fashion legend died unexpectedly, in 1957. A mere slip of a youth, the 21-year-old Saint Laurent was nevertheless up to the challenge. He shook the traditional couture clientele to its core with youthful silhouettes and styles like the A-line trapeze dress that hung with seeming effortlessness from the shoulders, the antithesis of the pinched waists and molded skirts that had been all the rage after the deprivations of World War II.

After a mandated spell in the torturous French military, Saint Laurent suffered a nervous breakdown and was dismissed by Dior in 1962. Out of the ashes rose the Age of Yves. With Pierre Bergé, his then-lover who became his lifelong business partner and friend, the designer founded Yves Saint Laurent YSL to encompass prêt-à-porter, or ready-to-wear. In 1966, they opened the first YSL Rive Gauche women’s boutique in Paris, followed soon thereafter by YSL Rive Gauche for men. Saint Laurent had given birth to a global brand.

His revolutionary Mondrian mini dress from 1965 is a core element of his fashion biography. It is a prime example of how Saint Laurent, an avid art lover and collector, looked to painters, from Goya to Picasso, Ingres to Matisse, for inspiration.

With its pure lines and hues, Mondrian’s ground-breaking 1935 color-block painting Composition C transmutes beautifully into a dress that is highly valued by collectors of contemporary fashion and widely copied commercially to this day. The design is the epitome of Saint Laurent’s aesthetic, requiring a meticulous hand-piecing of each color block so that, despite the body’s curves, the visual plane is as flat as a canvas when the garment is worn. Mondrian’s purity met its match in Saint Laurent.

“I am no longer concerned with sensation and innovation, but with the perfection of my style,” Saint Laurent said four years before retiring, in 2002. After a long period of ill health, he died at his home in Paris on June 1, 2008.

Browse an extraordinary collection of vintage Yves Saint Laurent evening dresses, shirts, handbags and other clothing and accessories today on 1stDibs.

Luxurious and versatile, designer day dresses are as well suited to tea at an upscale hotel as they are to your next garden or rooftop party.

Today’s featherlight unisex day dresses — as well as the vibrant vintage day dresses of the 1950s and ’60s — look quite different from the heavy, fabric-rich de rigueur garments of the Victorian era. In the late 19th century, a woman of a certain standing might have multiple dresses to wear throughout the day: specifically, one or two for the daytime and one for the evening. For example, a long-sleeve silk dress with a prominently flared back and a round collar of gold beaded lace that hugs the neck would be suitable for stepping out during the day, while a velvet gown trimmed in silk embroidery but overall comparatively informal in appearance would be worn for afternoon tea at home. At night, a silk velvet evening dress could feature natural world motifs such as butterflies (a characteristic of Art Nouveau design) and have short sleeves adorned with lace and ruffles and a scooped neckline — the perfect attire for the theater.

During the 1920s, after all the chores were done, a woman would change from her housework clothing into a more fashionable day dress to run her errands or socialize. Some 1920s day dresses were brightly colored and featured bold patterns — a cotton dress with a dazzling floral print, perhaps, or, in the case of the more venturesome Art Deco apparel sold in high-end couture fashion boutiques of the era, semi-sheer silk garments embellished with three-dimensional beadwork or rich metallic gold lamé.

Today, a closet full of casual vintage day dresses is a must-have. Whether you opt for black, crimson or beige, day dresses bring an element of glamour to your next appointment, and in the summer, who doesn’t love a wonderfully simple, lightweight day dress cut in cotton and linen?

Because different fashion designers of every decade have offered their own take on the widely loved day dress, you’ll be able to find a variety of vintage and designer day dresses on 1stDibs. Search by creator to find enduring designs by the likes of Emilio Pucci, Pierre Cardin, Yves Saint Laurent and Christian Dior, or browse by period to uncover a scintillating collection of cotton and satin patterned dresses of the 1950s and ’60s.