An olive long sleeve t-shirt and chinos? This is easily a wearable outfit that you could wear a variation of on a day-to-day basis. A good pair of black leather desert boots is the most effective way to punch up this getup. So when summer is over and autumn is taking its place, this ensemble is likely to become your favorite. When it comes to casualwear for 20-year-old gentlemen, this getup looks good on most gentlemen.