You'll be amazed at how extremely easy it is to pull together this sophisticated look. Just a navy wool double breasted blazer and black and white houndstooth dress pants. Get a bit experimental with footwear and introduce a pair of black leather derby shoes to the equation. As a man in his 30s, you want to start dressing in a dressier manner. If that's the case, outfits like this prove useful as a source of inspo.