I’d love to tell you that I’m off traveling the world (or shopping) most days of the week. Truth is, I spend the majority of my time at the office—and fulfilling those bouts of wanderlust with street-style blogs. Just click and you’re people-watching in Paris, a regular post-modern-day flaneur. Or maybe it’s Copenhagen, or Tel Aviv, or Tokyo ’s Harajuku neighborhood. Oh, there are so many beautiful sites, but the seminal one? The Sartorialist, from New York-based photographer Scott Schuman. It's become a veritable online destination (and a well-dressed one at that), and now, it’s manifesting itself offline, too.

First, in August, Penguin published The Sartorialist book, a compilation of the photographic muses and musings from Schuman’s site. And this Tuesday, in the frenzy of New York Fashion Week, Schuman launched SartoriaLUST, a temporary showcase of designer pieces that he personally lusts for—many of which he discovered while shooting along the New York-London-Paris-Milan fashion circuit—at Barneys, on New York’s Madison Avenue, through September 29. A second pop-up shop opens today at Liberty of London (through September 30).

“Style-wise, I live between all of these worlds,” he told me at the N.Y. launch party, “and the shop is my point of view. It’s American,” he said, clutching the lapels of his Ralph Lauren suit, “and also Italian”—he points to a double-breasted Boglioli blazer that has brightly colored buttons—“with a little A.P.C., Dries Van Noten, and Junya Watanabe mixed in.”

Schuman picked his favorite designer pieces from each store and combined them with exclusive SartoriaLUST items, created in collaboration with international labels like Roda (merino wool checked scarves) and Want Les Essentiels de la Vie (leather luggage, including camera bags).

A good bunch of Schuman's friends and photo subjects joined in on the fun in N.Y., including Valentino Ricci of Sciamat, in Puglia, who did a one-day trunk show for his strong-shouldered, hand-crafted suits; Lino Ieluzzi, owner of Al Bazar Milano, where Schuman sourced hand-rolled ties and leather double-monk strapped shoes; and—perhaps his greatest lust object, and the greatest partner in his online-meets-offline romance—Parisian fashion illustrator and fellow style blogger Garance Doré, his girlfriend.

Christine Ajudua is an editorial assistant at Travel + Leisure.