This combination of a mustard crew-neck t-shirt and jeans is hard proof that a straightforward casual getup doesn't have to be boring. Give a hint of elegance to your outfit by wearing a pair of brown leather brogue boots. So as you can see, it's a dapper, not to mention spring-appropriate, combination to have in your seasonal arsenal. Those who are curious whether you can still pull off modern casual outfits as you step into your 40s, this combination should answer your question.