This pairing of a grey plaid blazer and white dress pants is a never-failing option when you need to look like a true expert in modern men's style. If you don't know how to finish off, introduce a pair of black leather tassel loafers to the mix. Keep this combination in your head when warmer days are here, and rest assured, you'll save time racking your brain for what to wear on more than one occasion. In your thirties, you want to start dressing more like a mature gentleman. In this case, inspiration like this comes in handy.