For a casually cool ensemble, consider wearing a raincoat and a yellow short sleeve shirt — these pieces fit beautifully together. If you need to immediately kick up your look with one single piece, why not add a pair of dark brown leather chelsea boots to this ensemble? As the weather starts to cool down, you'll find that a look like this is ideal for autumn. When it comes to style tips for 30-something gents, this combo looks good on almost any gent.