For a look that's very straightforward but can be smartened up or dressed down in plenty of different ways, consider teaming an overcoat with a red crew-neck sweater. This is a stylish yet age-appropriate outfit for a maturing guy.
Red Crew-neck Sweater with Overcoat Smart Casual Warm Weather Outfits In Their 30s
If the dress code calls for a smart casual ensemble, you can go for an overcoat and a red crew-neck sweater. A pair of burgundy suede boat shoes will add a little edge to an otherwise sober getup. So take cues and be the sharpest dressed gentleman your age.