Maybe I'm just feeling argumentative this morning, so take it all in good humor. My understanding is that Trad is an artificial construct that has certain, narrowly defined characteristics. I say artificial because the people who originated the look certainly didn't think of themselves as Trad or even realize that they were doing anything unusual.
The sack jacket is one of the fundamentals of the construct. Change it, and the whole shebang goes out of whack. I don't even wear sack jackets, so I don't have a dog in the fight. As an independent observer, however, I can clearly perceive the protocols of the construct. It's OK to wear something outside the canon. But the canon is what it is.
DocD,
To be compared to Manton, even scathingly, is a bit of an honor!:icon_smile: