Just curious, is Huynh Hoan Tailor still around? They would be located at 13 Phan-Van-Dat in Saigon. At least, that's where they once were. My father claims they were the best tailors back in the day.
I was over at my parents' place for lunch last weekend and pulled out the only suit my father has kept. He recently told me he had it made about 40 years ago with cloth a good friend had given him. Pictures in family albums confirm that my old man's memory re that suit is pretty accurate.
Here are a few closeups I snapped:
label

handsewn buttonhole

messy inside = proof buttonholes were handsewn?

inside pant hem

faux lapel buttonhole

underside lapel

The suit is SB 2B with very narrow lapels and skinny single pleat trousers. The most obvious sign of the suit's age are its lining which isn't as fresh as it once was. When worn, the suit sags as only a suit that old (which has seen a lot of wear) can. I believe Foo refers to this as 'well worn and lived in'.
I can only hope to have a suit still fit me that well after 40 years.