If you don't like putting too much effort into your combos, pair a cardigan with charcoal jeans. If you need to immediately rev up this getup with shoes, why not complement your outfit with a pair of dress boots?
Cardigan with Dress Boots Cold Weather Outfits For Men
For something more on the casual and cool end, opt for this combo of a cardigan and navy jeans. Complete this getup with dress boots to avoid looking too casual.