Our Planning and ED people share a department and an office floor in City Hall. The ED people tend to dress more formally, usually dress shirt and ties but rarely suits. The Planners tend to be more casual. One guy is a bit of a clothes hound, another usually wears a dress shirt and tie. The rest of us: Lots of polo shirts, dressier button-up shirts with no ties (like me today), khakis are not really a problem (this is Northern California, home turf of Gap).
At Planning Commission and City Council, though, dress pants, dress shirt, tie, and dark jackets. Even that is slipping, a bit.
Unfortunately, my liking for sweets and Mexican food makes the necktie my enemy-since I am too proud to buy larger shirts with bigger collars .