This casual pairing of a denim jacket and grey sweatpants is extremely easy to pull together in no time flat, helping you look amazing and prepared for anything without spending too much time searching through your wardrobe. A pair of low top sneakers is a great choice to finish off this ensemble. The arrival of cold weather needn't mean you sacrifice your style, and this outfit is hard proof just that. Casual combinations for 20-year-old gentlemen aren't actually that hard, as you see.