This off-duty pairing of a red and black check flannel long sleeve shirt and a black crew-neck t-shirt is extremely easy to pull together in next to no time, helping you look stylish and ready for anything without spending too much time combing through your wardrobe. For something more on the casually edgy side to round off this ensemble, introduce a pair of black suede high top sneakers to the mix. All in all, an ideal demonstration of off-duty fashion for 20-year-old gents.