Following up from yesterday… In many cities, it’s common for white-collar male workers to wear shirt+tie, though casual Friday is becoming more popular in some companies.
For some people, it appears that even the suit jacket is compulsory, including on the hottest days. From what I can see, this primarily seems to include (male) politicians and TV journalists.
On weekends some of them doff the tie but keep the jacket on. Ditto when they go to the country.
Perhaps the very expensive jackets (worn by presidents and prime ministers) have water cooling inside or something, so the occupant doesn’t end up sweating like a pig?