Do you, don't you?

[JSFMACLJR]

On three-piece suits, (when I wore them) I left the bottom vest button undone, as I understood that there was a tradition so to do. With Highland attire, I button them all, as I am unaware that there is a similar custom in that area. Highland tradition is much older than Edward VII.

I don't quite follow your reasoning here. I, and many others, leave the bottom button of a waistcoat undone. What do you mean when you say "Highland tradition is much older than Edward VII"?

Waistcoats are much older than the late King Emperor too.