The items at the July 2 auction include a 1958 cocktail dress for Dior and a 1970s Rive Gauche camel cable-knit sweater trimmed in fox fur similar to one Jacqueline Kennedy Onassis wore.

"What's exciting about the collection is that you see the progression of his career. He was a real style-setter," said Christie's couture specialist Laura Leyfer.

Saint Laurent died on June 1 at age 71. Considered one of the most influential designers of the 20th century, his creations — from pop-art print mini-dresses to peasant skirts and elegant pantsuits — endure to this day.

The cable-knit sweater — with a pre-sale estimate of $250 to $400 — is a version of one Onassis was often photographed wearing, a style she owned in several colors, according to Christie's auction catalog.

This photo provided by Christie's auction house shows an Yves Saint Laurent cut-out floral necklace from Spring/Summer 1990 with an estimated selling price of $1,000-1,500. A month after the death of Yves Saint Laurent, Christie's is auctioning seven pieces of the legendary French fashion designer's clothing and jewelry, including this necklace, representing nearly every decade of his career. (AP Photo/Christie's Images LTD.)

This photo provided by Christie's auction house shows an Yves Saint Laurent cable-knit and fox fur sweater jacket with an estimated selling price of $250-400. A month after the death of Yves Saint Laurent, Christie's is auctioning seven pieces of the legendary French fashion designer's clothing and jewelry, including this sweater, representing nearly every decade of his career. (AP Photo/Christie's Images LTD.)