Peter Brant II and Harry Brant. (PatrickMcMullan.com)

At the party he co-hosted at the Jitrois pop-up store in Soho, Peter Brant II was saying how much he liked his leather pants. “I just think their elastic leather is really fantastic,” said the fast-talking elder son of the Brant Publications magnate and art collector Peter M. Brant and the supermodel Stephanie Seymour. “It looks great on everybody! As you can see,” he said, gesturing to his black-and-silver Jitrois leather pants. The pants cost $2875. “That’s the main attraction.”

“I sometimes wear women’s pants, because I have very very tiny legs,” said Harry Brant. The younger Brant brother declared his Jitrois pants “so comfortable. The nylon looks like leather, but it feels like you’re wearing sweat pants.”

While guests including Carlos Mota and Keegan Singh milled around sipping sweet, pink champagne, the Brants discussed their summer plans. Peter, an art history student, is going to be working in the jewelry department at Sotheby’s. Harry is looking forward to taking in the couture shows in Paris in July. Especially Dior, where former Jil Sander designer Raf Simons will present his début collection.

Both boys say they welcome fashion’s other big news — the announcement that all 19 global editions of Vogue magazine will cease working with models under the age of 16, or who, in the magazine’s words, “appear to have an eating disorder.”

“I think that it’s a good step to, like, try to regulate the modeling industry,” said Peter II.

Stephanie Seymour began her career in Paris at age 14. “It’s a different time now than it was in the ’90s,” said Harry. “People like my mom, or all those big models, they started when they were 14 or 15. But the requirements of being a model then were very different than they are now. There was less strain on their bodies. I just think it’s a very good thing that they’re doing, actually. Because it protects the models.”

Jitrois, which opened its first boutique in Nice in 1976 and might best be described as a kind of French Roberto Cavalli, is a brand little known in North America. But Jitrois U.S.A.’s Randi Jacobson is looking to change that. She switched from being a multi-brand retailer to selling only Jitrois because, she says, it kept selling out. “And their clothes last,” Jacobson, who’s been shopping the brand for 25 years, says. “I’m still wearing the 25-year-old clothes. So long as they don’t have shoulder pads.” The pop-up Jitrois has been open since last fall, and a permanent boutique is set to open its doors in November.

The DJ, whose name was KISS, wore a white Jitrois dress made of stretch leather panels joined with faggoting. It retailed for $4275.

Swedish style blogger and budding tech entrepreneur Elin Kling popped in as the evening wound down. NowManifest, the blogging platform and advertising network Kling cofounded with entrepreneur Christian Remröd, was acquired this week by Fairchild Fashion Media, the unit of Condé Nast that publishes Women’s Wear Daily, Style.com, and the magazine Style.com/Print. An elated-looking Kling wouldn’t comment on the value of the deal — “I don’t think that’s public” — but did say that the new ownership wouldn’t change anything for the bloggers who use NowManifest. That cohort includes some of the most influential style sources out there: Vogue Japan editor-at-large Anna Dello Russo, Bryan Grey Yambao, better known as BryanBoy, Rumi Neely of Fashion Toast, and Industrie magazine.

Yambao, for one, was quoted shortly after the deal was announced expressing his displeasure that he hadn’t been notified until less than 24 hours before the acquisition was made public. Fashionista characterized Kling and Remröd’s handling of the deal as “underhanded.”

Kling expressed surprise at the criticism. “I didn’t even tell my boyfriend until two days before!” she said. “It was a huge, huge deal.” She said that NowManifest has never exerted any editorial control over the Web sites it hosts, and that won’t change under Condé Nast’s watch.

As the room filled to capacity it became clear why Bill Cunningham was here: this night was about the dresses—almost to the point of sensory overload.

Selita Ebanks in her floor-length disco ball? “Oh God it’s mesmerizing, she looks so beautiful!” Not to mention Zac Posen in his chocolate brown double-breasted. And we spied the fashionable party trio that is Harry, Peter Brant Jr. and Michelle Harper.

"Look at those shoes!" we exclaimed.

“Damnit, purple suede. You can’t beat that,” replied a colleague, as we both peered back down at our comparatively average footwear.

Speaking of dandies, everyone’s favorite ex-pat Euan Rellie rolled in with a crew who appeared to be the remnants of an immaculately tailored stag party, a fact further emphasized when they seized an entire dinner table and dug into massive hunks of filet. “You know how these things go, bud," Mr. Rellie said between mouthfuls. "Sometimes the boys need a night out!”

Each elevator arriving at the 36^th floor ballroom brought with it a new wave of flashbulbs and floor-lengths, until one particular attendee broke the pattern: Doutzen Kroes. Purple pantsuit, ponytail, power stance. At some point during her mini photo-shoot with fellow Victoria’s Secret model Erin Heatherton we could have sworn we heard her humming “my milkshake brings all the boys to the yard.” Sadly, this fact was unverifiable.