Go for a charcoal plaid blazer and a blue dress shirt and you'll ooze elegance and refinement. Add a more laid-back touch to by slipping into a pair of white leather low top sneakers. Keep this look ready to go come warmer days, and rest assured, you'll save a ton of time racking your brain for what to wear on more than one occasion. As you slip into your 30s, you probably want to start dressing more professionally. In this case, looks like this come in very useful.