For something on the casually edgy side, you can easily go for a dark brown crew-neck sweater and a white crew-neck t-shirt. Give an easy-going feel to your ensemble by slipping into beige canvas work boots. When it comes to casual outfit ideas for guys over 30, this outfit looks nice on almost anyone.
If you like classic pairings, then you'll love this combination of a dark brown crew-neck sweater and a white crew-neck t-shirt. In the footwear department, go for something on the dressier end of the spectrum by finishing with black leather derby shoes. As a gentleman in his 30s, you probably want to start dressing maturely. In this case, combos like this come in very handy.