I think Zippy-kat is right about the saddle pads. For english riding hunters and jumpers the saddle pads can be thin and cut to the shape of the saddles unlike the big rectangular saddle pad/blankets used in western riding. Where is that photo from?
About the hunter clip in winter, where I used to ride in southern New England there were a few horses clipped like that but with the longer hair left on the legs, they would just wear a heavy weight blanket when they were turned out in the field or even in their stalls if it was too cold. I think I will look for some horse websites to see some photos of horse blankets and saddle pads, etc...