I'm located in the West Coast (not too cold) and will be starting work real soon in a conservative business casual environment. Everyone that I've met so far wears dress pants, dress shoes, and dress shirt without the tie.
When fall gets cooler and winter comes along, what would be a good alternative to wearing a suit jacket to stay warm while keeping it business casual? The only thing I can think of would be a wool / cotton sweater over the dress shirt. I know most people may suggest an odd blazer, but I feel like that may be too much for a first year fresh meat associate when no one else wears one unless you're the top dog boss in the building. I'd like to look humble and not so pretentious like an interviewee arriving with cufflinks.
Also, what are your suggestions for fall / winter business casual ensemble besides the usual dress shirt without the tie + dress pants + dress shoes.