Apparently Kennedy’s jackets which he wore with both buttons buttoned were of a special cut designed to be worn that way. So sayeth the internet.
What do you mean when you say "No to topic"?
The topic asks a question requiring one answer and the actual post a different question, both designed to elicit the same information/opinion, but in opposite terms.
I wear compression engine turned buckles with almost everything,
I have some blazers that would probably seem formal and some that would seem casual to some folks here. I wear them pretty much interchangeably.