What an odd turn this thread has taken! I never would have imagined such disdain, prejudice, and intolerance for that classic mainstay of menswear, the db jacket (both on its own and as part of a suit). Maybe it's because I'm not in business (and, thus, don't run with that highly delineated pack), but from where I sit perched in San Francisco I would never have dreamed that this could be such a big issue. I can understand pondering whether a db might be appropriate for a specific occasion, but to call the whole enterprise into question seems a bit extreme. I also don't think the db can be so dismissively consigned to the ghetto of fat people or old people or thin people, dandies or the sartorially mad. A well cut db jacket--like any well-tailored garment--will flatter nearly anyone not in the extreme margins of physical stature (as Martinis at 8 notes).
Regarding the button issue, I think there's a place for all these styles. The only one I truly don't much care for is the elongated 6X1 buttoning truly on the bottom button. Worn with extreme low vamp loafers and seriously padded shoulders, this was the nightmare of the late 80s/early90s. Even if little seen, the 4X1 is a classic. The four button stance knocks the jacket down just a notch in formality, thus making it particularly appropriate for a country jacket. I have a beautiful 4X1 dark blue flannel suit with white and sky blue pinstripes made by Henry Poole back in the 1970s (double vented and with ever so slightly angled pockets) that is a classic for the ages. I wouldn't wear it to do some serious zero-sum negotiating, but then I don't do that so it's not much of a worry. The 6X2 is perhaps the least contoversial style, having been in fashion for a number of years now. The other interesting version is the 6X1 that buttons on the bottom button but has the lapel break midway between the bottom and middle rows. This is the RLPL cut (at least when PL was being made by Chester Barrie) and I seem to recall reading here somewhere one of these years that it was a resurrection of/homage to a vanished Kilgour cut.
Anyway, let's just show some love to our old and esteemed friend the db jacket.