I know the winter scene on the dish is simply an artist rendition of a holiday situation but it’s pretty obvious said artist has never hitched a horse to a sleigh. This sleigh would be light duty (one-horse open sleigh) thus a collar and hames would be replaced by a saddle and breast strap as in the picture. (Geometry is wrong but the thought is ok). The horse is going to pull the weight with his chest. But this is the last of the “real” harness stuff. There needs to be a solid attachment to the horse and on a one horse sleigh that would be accomplished by two shafts (or shaves) on either side of the horse. These would be to maintain proper distance from the back of the horse to the front of the sleigh (way too close in this image) but more importantly for steering of the sleigh. They would be hitched to the saddle mid-horse. Then the straps you see from the horse back to the sleigh, called traces or tugs, do just that, tug the sleigh along. But how to stop the sleigh from slamming into the horse? There should be a breaching seat and cruppers, leather straps that come behind the horse (breaching, or britchin) and back to the shafts/saddle, and under the tail (cruppers) to keep things in place. These are the brakes and “hold back” when slowing down or going downhill. To top it all off there are no lines from the driver to the horse head to drive with. I’m guessing that is how the the one horse open sleigh got upsot.