As you can see here, looking polished doesn't require that much effort. Opt for a double breasted blazer and a dress shirt and you'll look incredibly stylish.
Double Breasted Blazer with Dress Shirt Cold Weather Outfits For Women In Their 30s
For a goofproof semi-casual option, you can rely on this pairing of a double breasted blazer and a dress shirt. A pair of grey suede ankle boots is a smart idea to round off this ensemble.