LEATHER JACKETS bring to mind noise-polluting motorcycles—blame Marlon Brando and the Hells Angels for that—but Hermès, the 182-year-old French label, has crafted a leather jacket that connotes a quainter form of transportation: the horse. “This jacket is made of Étrivière lambskin, an Hermès heritage leather, originally used for horse-harness straps,” explained Véronique Nichanian, the label’s men’s artistic director. Equestrian leather is not a startling choice for a brand that began in 1837 as a saddlery and whose logo still depicts a horse-drawn carriage. Little else about this coat is predictable, however.