Pairing a cardigan with a white and blue dress shirt is an awesome choice for a dapper and refined outfit. Feeling creative? Spice things up by rocking brown leather dress boots. Seeing as temps are getting lower, this ensemble is a viable pick for the time in between seasons. As a 30-something Millennial gent, you want to start dressing more professionally. If that's the case, outfits like this come in useful.