For a safe relaxed casual option, you can always rely on this combo of a dark brown crew-neck t-shirt and brown camouflage chinos. Add an easy-going vibe to your ensemble by wearing a pair of black leather high top sneakers. This getup is a fail-safe option if you're hunting for a great, season-appropriate getup. When it comes to casual fashion for men in their 20s, this combo looks nice on almost any man.