A blazer and a red crew-neck sweater are essential in an elegant man's closet. A pair of brown leather casual boots is a nice option to complement this ensemble. If you want people to see maturity in you, an ensemble like this is a viable option.
Red Crew-neck Sweater with Blazer Cold Weather Outfits For Men In Their 30s
For a look that's very straightforward but can be dressed up or down in a multitude of different ways, try teaming a blazer with a red crew-neck sweater. As a 30-something, you probably want to start dressing more professionally. If that's the case, getups like this are a tested option.