Do you, don't you?

[kiltimabar]

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.

I simply meant that a custom originating in "civilian" dress doesn't necessarily translate into a change in the separate tradition of the way highland attire is worn. Some do--wing collars on formal shirts for example. Others--like, say, a blazer patch on an Argyll jacket, don't.

If anyone wants to unbutton his waistcoat, (or wear a blazer patch) I'll consider that his business and none o' my own.