A navy crew-neck t-shirt and olive camouflage cargo pants are must-have must-haves if you're picking out a casual closet that holds to the highest menswear standards. Take your outfit in a more sophisticated direction by rounding off with a pair of dark brown leather loafers. Seeing as fall is in full swing, this ensemble seems a savvy choice for the transitional season. This one is a stylish yet age-appropriate ensemble for guys in their 20s.