This laid-back combination of a denim jacket and a black crew-neck t-shirt is a foolproof option when you need to look cool and casual but have zero time. Black leather chelsea boots are an effortless way to inject an added touch of style into this ensemble. You can bet this combination is great come spring. As you move into your 30s, you probably want to start dressing like an adult. In this case, ensembles like this become a great source of inspiration.