It's not big jackets. It's the jacket etiquette. You must take the jacket off, otherwise it'll be too warm with all the people crammed in there and you will sweat, essentially making the climate in the car worse & smelly, then going outside where you'll get sick, since you're now wet. I don't get why people choose to suffer.

I will wake up at 5 to avoid that and the masses on public transport if I actually have to go to the office.