People can become so used to certain styles and colors that they don't even classify certain sartorial habits as fashion. They don't notice the cultural currents that surround them anymore than a fish notices that it's wet. To them, the word fashion is associated with only the most loud and heavily marketed forms of fashion.

It's similar to how people associate the word diet with slimming diets. In truth, as long as we are eating, we have a diet. And as long as we dress ourselves, we are making fashion decisions.

Conservative garb is not necessarily timeless. Some subcultural or countercultural fashions manage to loosen their connection to the year in which they were born. If you showed me a picture of a man in a suit taken in 1978, I could probably guess that it was from the late seventies by using the color palette and fit as clues. I would have a harder time identifying the year in which a photo of a skinhead was taken.

3-piece suits from 1917 were not made in the same styles as the ones that you can find in the store today, but Converse All-Stars, though designed in 1917, are still widely available. I can also go to a shoe store and buy a new pair of Adidas Superstars that were designed in 1969 or Adidas Sambas designed in 1950.