For a look that's very straightforward but can be dressed up or down in a myriad of different ways, try teaming a dark brown overcoat with chinos. Complete your look with a pair of beige tassel loafers to make the outfit slightly more refined.
Beige Tassel Loafers with Chinos Smart Casual Cold Weather Outfits
For something on the semi-casual end, wear this combo of a camel overcoat and chinos. And if you need to easily spruce up your outfit with one single piece, add a pair of beige tassel loafers to the equation.