You'll be amazed at how extremely easy it is for any guy to get dressed this way. Just a grey v-neck sweater worn with black skinny jeans. You could take a more classic route on the shoe front by slipping into a pair of black leather derby shoes. This ensemble looks great on 30-year-old gents.
Grey V-neck Sweater with Black Leather Derby Shoes Smart Casual Chill Weather Outfits In Their 30s
Why not dress in a grey v-neck sweater and black jeans? As well as super functional, these two pieces look good when worn together. Black leather derby shoes will give a sense of polish to an otherwise utilitarian look. If you want to project maturity, a look like this is what you're looking for.