This off-duty combo of a charcoal horizontal striped crew-neck sweater and navy jeans is super easy to throw together in next to no time, helping you look on-trend and ready for anything without spending a ton of time combing through your wardrobe. Add a pair of tan suede casual boots to the mix for a masculine aesthetic. As a 30-something Millennial gent, you probably want to start dressing like an adult man. That's when combos like this become a great source of inspo.