Consider wearing a charcoal crew-neck sweater and charcoal jeans to assemble an interesting and modern-looking relaxed ensemble. White canvas low top sneakers will be a stylish accompaniment to your look. Smart casual combos for stylish gentlemen in their 20s aren't actually that hard.
A charcoal crew-neck sweater and black chinos are among the fundamental items in any gent's great casual wardrobe. For something more on the relaxed end to complement this look, complement this look with white canvas low top sneakers. As you're getting to your 30s, you probably want to start dressing more maturely. That's when getups like this come in very useful.