For a safe classic and casual option, you can rely on this combo of a white button down blouse and dress pants. When not sure as to the footwear, complete your look with a pair of black leather pumps.
White Button Down Blouse with Dress Pants Dressy Chill Weather Outfits
Go for classic style with a white button down blouse and dress pants. Introduce black leather loafers to the mix for extra style points.