For a relaxed casual ensemble, try teaming a crew-neck t-shirt with navy jeans — these two pieces go perfectly well together. Feeling bold? Play down this outfit by rocking tobacco work boots. During winter, when warmth is critical, it can be easy to surrender to a less-than-stylish ensemble. This ensemble, however, is a practical illustration that you can actually stay comfy and remain stylish during winter. This pairing proves that stepping into your 30s is no reason to shed casual style altogether.