This modern casual combination of a navy and white horizontal striped crew-neck t-shirt and black skinny jeans is super easy to pull together in seconds time, helping you look on-trend and ready for anything without spending too much time searching through your closet. Infuse an added dose of polish into your getup by wearing a pair of dark brown leather casual boots. And if we're talking casual dressing ideas for middle-aged gents, this getup is perfect.