If you wish take your casual fashion game up a notch, pair a black crew-neck sweater with olive cargo pants. If not sure as to the footwear, go with white leather low top sneakers.
Black Crew-neck Sweater with Olive Cargo Pants Cold Weather Outfits
This casual pairing of a black crew-neck sweater and olive cargo pants comes in useful when you need to look nice in a flash. Introduce a pair of white and brown athletic shoes to your look to loosen things up.