A black long sleeve shirt and skinny jeans are great menswear staples that will integrate well within your daily casual fashion mix. Don't know how to finish this getup? Wear dark green leather oxford shoes to bump it up a notch. In the winter months, when warmth is paramount, it can be easy to settle for a less-than-stylish getup in the name of practicality. However, this getup is a vivid example that you totally can stay snug and remain equally stylish during the winter months. Wear this ensemble to show your maturity as a 30-year-old gentleman.