This is hard proof that a suit and a black crew-neck sweater look awesome if you wear them together in a sophisticated look for a modern man. Introduce a pair of black leather chelsea boots to the equation and the whole look will come together perfectly. Certainly, a good example of grown-up style.
Black Crew-neck Sweater with Suit Chill Weather Outfits In Their 30s
You'll be surprised at how very easy it is to get dressed this way. Just a suit worn with a black crew-neck sweater. Burgundy leather derby shoes look great here. This outfit is most probably exactly what you're looking for as a gentleman in his thirties.