Go for a black cardigan and a navy dress shirt to look elegant but not particularly formal. For something more on the classier end to finish off your look, complement your look with a pair of tobacco leather loafers. As you can see, in your 30s you have a vast array of outfit options.
Navy Dress Shirt with Black Cardigan Warm Weather Outfits For Men In Their 30s
Go for a black cardigan and a navy dress shirt if you're going for a neat, dapper outfit. Get a bit experimental with shoes and enter a pair of brown leather tassel loafers into the equation. A good source of inspiration for those on a mission to shift their personal style towards maturity.