If you've reached this age without one, don'y buy one. Certainly, a dark blue /black suit/white shirt/silver tie will act well in lieu of a dinner jacket (which hardly requires a pleated shirt underneath). Having had a succession of "Tux" since I was 15, and even "full-fig penguin" (white tie and tails) during the years I was shepherding debutantes or paying to "fathering" a couple, I keep one for necessar occasions, but for cruising,, I'll stick to what has carried me throughhout the world for half a century, Blue Blazer, grey slacks, black tassle loafers, white shirt (after 6PM, no button downs or colors) and relatively "formal" silver or muted pattern tie. During the day, if tie and jacket are required, I revert to tan slacks or chinos and brown penny loafers.

Laughably, I end up, aside from more colorful sport and golf type shirts, dressed in the same clothing as I wore in 1956, testimony to the service life of Blue Blazers.