Here's an interview with Cary Grant from the Winter 1967/68 GQ (back when it really was quarterly). The entire thing is well worth reading, but I especially noticed his comments on timeless style, which echo my own:
"I've never, as far as I can compare the efforts of others with my
own, gone to any special trouble to acquire clothes that could be
regarded as noticeably fashionable or up-to-date. Some of my suits are ten to twenty years old, many of them ready-made and reasonably priced.
"No, it isn't only money that determines how well a man dresses—it's
personal taste. Because of the demands of my work, I've purchased dozens
of suits over the years and they all have one attribute in common: they
are in the middle of fashion. By that I mean they're not
self-consciously fashionable or far out, nor are they overly
conservative or dated. In other words, the lapels are neither too wide
nor too narrow, the trousers neither too tight nor too loose, the coats
neither too short nor too long. I've worn clothes of extreme style, but
only in order to dress appropriately for the type of character I played
in particular films. Otherwise, simplicity, to me, has always been the
essence of good taste."