This pairing of a navy and green plaid blazer and a black crew-neck t-shirt is solid proof that a pared down off-duty look can still look truly sharp. On the shoe front, go for something on the dressier end of the spectrum and round off your ensemble with black velvet loafers. The much awaited springtime calls for neat combos just like this one. The ability to sport combos like this is one of the dividends of getting into your 30s.