The true test will come in late spring in Paris, where Nadal will defend his 2012 title at the French Open, a tournament he's won an astonishing seven times.

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During Fashion Weeks in New York, Paris and Milan (held in spring and fall), a model can be sent on as many as a dozen go-sees a day for six weeks.

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Blame Rooney Mara (or the androgynous computer-hacker character she plays in The Girl With the Dragon Tattoo), but the spring couture shows in Paris this week definitely had a punk-rock attitude.

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We were also surprised to see Karl Lagerfeld line Chanel's runway with wind turbines and solar panels in a preview of Spring 2013 Paris Fashion Week.

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Indeed, she was right on trend: The Spring 2012 collections that just ended in Paris earlier this month were all about transparency and longer lengths.

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But Nadal rebounded from the loss and beat Djokovic twice this spring, and then again in the French Open final for his record seventh title in Paris.

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On the recommendation of several British fashion editors, I visited Vestiaire Collective, the Paris-based resale (translation: the clothes are preowned) site that launched in the U.K. last spring and now ships to the U.S. The selection is thoroughly high-end (celebrities Sophie Dahl and Rachel Weisz have donated goods), and each piece is vetted by in-house specialists who are trained to weed out fakes.

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