This combination of a brown wool blazer and brown chinos can only be described as devastatingly stylish and casually smart. Feeling adventerous? Mix things up by finishing off with brown leather double monks. You see here that just because it's cold outside doesn't mean your combos can't be both warm and on-trend. As you head into your 30s, you probably want to start dressing more like a mature gentleman. In this case, inspiration like this proves very useful.