Actually, I was so intrigued on who really was the famous equestrian person. Just found out that it was John Whitaker who was a showjumper who rode a horse called Milton who won approximately 1 million pounds in prize money!
Know more about him? He is is a British equestrian and former Olympian. Horses he has partnered include Ryan's Son, Milton and Gammon in the sport of show jumping. Milton is arguably the horse Whitaker is the most famous for riding; having competed him successfully several times at Olympic levels. Maybe the time when he was not yet famous, he used to wear equestrian apparel at TheEquestrianCorner.com for sure. Well, I'm just guessing! :)