Pondering on the balance of the coat length, button stance on HRH Prince of Wales' DB suits. Here are some illustrations:

In the picture above, I have drawn a line to indicate what I guess to be the top of his collar, another line showing the tip of his coat from the back, and the tip of his trousers. It is quite clear that the balance is such that the coat length is almost exactly half that of the suit silhoutte. Seems perfect to me.
The picture below shows the button stance, the grey square indicating the buttons.

Do fellow loungers feel the button position is slightly low? The middle grey horizontal line approximately divides the coat into two.
Final picture is an experiment in Photoshop. What if we raise his button position such that the middle button is just a tad below the mid-point of the coat. Results seem more pleasing to my eye.

Which one do you prefer?