The fashion set has long taken inspiration from equestrian sports, from the ubiquitous boots-tucked-into-pants trend (adopted from the breeches and riding boots of traditional hunting dress) to the moniker of one of the more lucrative, and recognizable, brands in fashion history (perhaps you've heard of Polo Ralph Lauren?). For Fall, Miuccia Prada looked to the incredibly competitive sport of horse racing, dressing her Miu Miu catwalkers in very literal interpretations of jockeys' uniforms. But while not everyone can pull off a pieced silk jumpsuit, clothes horses and lovers of horses can all get into a new documentary about the most exciting event in the equestrian world, the Kentucky Derby. "The First Saturday in May" (named for the weekend each year when the thoroughbred stakes race is run) is an independent film written, directed, and produced by Brad and John Hennegan. The doc follows six trainers and their equine charges from Indiana to Dubai for the year leading up to the 2006 running of the Derby—a cast of colorful, sometimes hilarious personalities and their beautiful four-legged athletes. Included in the cast is the eventual winner of that year's race, Barbaro, whose declining health following an injury in the Preakness captivated the media. The film opens tomorrow, and the filmmakers are donating 25 percent of the box office receipts for the first week to the Grayson-Jockey Club Research Foundation, which funds a wide variety of equine medical researchers, including those studying laminitis, the painful hoof disease that eventually led to the euthanization of the mighty Barbaro. For more on the film, where to see it, and information on the Grayson-Jockey Club Research Foundation, see www.thefirstsaturdayinmay.com.