In 2006, Mr. Hand joined forces with Marcus Wainwright and David Neville of Rag & Bone and helped secure their first major cash infusion from the businessman Andrew Rosen.

“He’s been there since Marcus and I were two people in an office,” Mr. Neville said. “He’s seen everything, good and bad.”

He acts as consigliere as much as paper-pusher. “What he does is a lot like an agent,” said Robert Tagliapietra, the co-designer of Costello Tagliapietra, for which Mr. Hand ironed out terms of a collaboration with the Japanese discount retailer Uniqlo.

But that’s just the day-job part of his job.

Sitting through awards shows, engaging in the exchange of industry gossip, and picking up large tabs at the Boom Boom Room, these are the job requirements that Mr. Hand greets with the most relish. On his Twitter feed, @Handofthelaw, he posts selfies that highlight the fashionable life of a fashion lawyer, looking — to quote his good friend and fellow man about town, Euan Rellie — like a “1950s movie star.”

Everywhere he goes, he dresses the part. Mr. Hand’s ensembles almost always correspond to which clients he will be seeing. Thus the Rag & Bone uniform that he wore when meeting with its design team to discuss new product introductions in the corporate office upstairs from the West 13th Street store.

It left him quite well suited to head out into the Manhattan night.

First up: drinks with his friend and client Jason Stalvey, a 34-year-old who oversees a neurological sleep medicine practice at Columbia University by day and also $17,800 alligator-skin gym bags. (A selection of his bags are sold at Barneys.)