Really this is weather dependent, but most likely a pair of darkish skinny jeans, a shirt, blue (cotton) double breasted blazer, brogues/oxfords and matching belt. Most probably tan oxfords and matching belt to add some colour to the outfit (although they can get ruined by drink spillages...) If the weather is really hot then a merino cardigan.
Similar as above, really. Perhaps my All Saints Missile Duffle Coat or a waxed jacket for added warmth? (Not worn inside, obviously).
The same as the club, dependent on the venue. Add a pocket square or a tweed blazer if need be, and perhaps a jumper dependent on weather. Some blue trousers, rolled to see a flash of socks would also suffice. And my Mac adds a certain importance to the outfit. The leather jacket if I'm feeling lethal.
my camouflage pink onsie.
EDIT: i can't stop changing my mind.