I spied this couple almost immediately as I got out of my car at the equestrian photo shoot. The woman in particular had that sophisticated equestrian look to her. I waited until after I said hello to the other members of the group to go over to them to ask if I could take their photo.
I predicted rightly that they would assume I wanted take photos of their faces and start to turn to face me so I stopped them before they could by saying I wanted them exactly as they were and that I was going to take the photo from the back.
Not many people get that idea, it is pretty alien to most people, and to most photographers. But I got the shot and that is what is important.