Well she helped keep various couture houses, cordwainers, milliners, haberdashers, hosiers, cobblers, numerous Jewel houses and whatnot in business for decades! Come on Ann, let's not make out that she didn't 'do' anything for enterprise, business and commerce! Even Dior tried to dress her in his early post war collections and that was less than successful, not that it did his house any harm in the long term! Just kidding...but I am sure you get my drift?
With regards to style and why the Duchess managed to always seemed to be able to look fab! I think the Duchess of Windsor tended to know her own style boundaries and that Dior's New Look was about the only silhouette that she simply could not carry off, she did some of later lines far more successfully including the H line! The Sixties era could have proved her downfall, but Wallis stuck with the classic adaptations and became a loyal patron of Givenchy who created some spectacular garments, which Wallis snatched up and made her own including that wonderfully memorable blue and white striped dress that to this day is timeless! Even into her seventies Wallis seemed able to sense what was good on herself! Love her or hate her one has to admit she had "It" with a huge capital 'I' when it came to image, clothes and how to make them work for her!!!!!!
Interestingly I think Wallis made mistakes but she always managed to rebound and adapt, in this I think Diana, Princess of Wales was very similar as an 'Icon' of fashion! Both had pretty unlimited funds and both made mistakes but ultimately both found their niches ,which are and will no doubt remain timeless in the relevance to them and what they did and wore! Wallis was tiny, Diana a comparative Amazon and yet both achieved their own status as the ultimate exemplars of how clothes can be used in an image conscious world! Couture was probably, in Waliis' case the only way she knew how to fulfill her role as the Duchess of Windsor! No one would or could ever criticize her for not looking the part! Diana eventually used popular designers to make everyone realize that here was woman who could really carry off those spectacular creations such as those by Versace et al! She didn't actually need to be a Princess to do it! That is the parallel!