Offbeat scenario idea: what if "Golden Age of Haute Couture" continues?

In several TL's I've posted in (e.g., "Viva Balbo!") I've inquired as to what effects the ATL's events might have on the development of fashion and haute couture. I want to look at a scenario (much more of a cultural ATL than a political ATL; there won't be any battles here, unless it's enraged devotees of one style ripping the clothes off a fan of another style in the streets of Paris :D ) in which the so-called "golden age of haute couture" extends through at least the early 1960's, possibly even into the 1970's.

My proposed POD is actually twofold, in that two of the most famous designers of the 1947-1957 period don't die early:

Christian Dior (1905-1957, died of heart attack most likely caused by overwork):

http://en.wikipedia.org/wiki/Christian_Dior

Jacques Fath (1912-1954, died of leukemia):

http://en.wikipedia.org/wiki/Jacques_Fath

Thus, Dior slows down his work pace so that he doesn't pop off in 1957, probably turning over some of the burden of his atelier to his extraordinarily talented protege Yves Saint-Laurent, but continues to design; and Fath either doesn't develop leukemia, or gets treated successfully for it, and also continues designing. Dior was a consummate traditionalist - his famous "New Look" was essentially an updating of the lush styles of the Belle Epoque of the 1890's and 1900's for the late 1940's - and Fath frequently dabbled in innovative styles and materials. Both men were quite famous in their time; Dior, in fact, was the first true superstar couturier, even making the cover of Time shortly before his death OTL. Their design philosophies, particularly Dior's, dominated women's couture from the late 1940's to the late 1950's.

What effects will longer lives and careers of these two men have on the course of high fashion, and of culture in general?
 
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