This off-duty pairing of a grey overcoat and blue jeans is very easy to put together without a second thought, helping you look on-trend and ready for anything without spending too much time rummaging through your wardrobe. If you feel like dialing it up, make navy suede tassel loafers your footwear choice. This is a safe option for a killer look that will take you from winter to spring. This pairing suggests how to slay in casual dressing as a 20-year-old gentleman.