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Because if there was only one button then you couldn't leave the lowest one undone, which is the style. Therefore, two are required.

You know the little pocket within a pocket that most jeans have, in this future year of 2023? It's for a _pocket watch_, originally. Fashion tends to lead to vestigial details hanging around more or less indefinitely.

Funnily enough I've always heard that referred to as a "coin pocket", but since I live in a country that has barely used cash for the last 10+ years I thought this was very anachronistic and started putting my keys in there.

I used to think it was for (old, zippo-style) lighters. But nah, apparently it started off life as somewhere to put a pocket watch.

You mean the Airpods pocket?

People (arguably) don't do it because it looks better, but to signal that they are in the know about fashion.