Marrying a dark green blazer with charcoal dress pants is a savvy pick for a classic and polished look. Add a pair of dark brown leather chelsea boots to your outfit to infuse a touch of stylish effortlessness into your outfit. A practical illustration of practical style, this ensemble must be in your front hall closet when cold weather arrives. So if you need dressing tips for gents in their 30s, this pairing is a great example.