[Hot Tabasco]

The latest craze at work/indicator of the decline of western civilization is wearing a down vest in the office.

That's usually because the thermostat is turned down and portable heaters are not allowed under your desk.

[DoodleBob]

In the summer?

Down or “puffer” vests (!) started as a sort of tech bro thing, then expanded to middle aged men trying to appear relevant.

Guys wearing a vest in the office is the fashion equivalent of a high rising terminal. https://en.wikipedia.org/wiki/High_rising_terminal.