A white crew-neck t-shirt and black leather jeans are essential in any man's great casual sartorial arsenal. Make your getup slightly more sophisticated by finishing off with a pair of dark brown suede chelsea boots. So if it's a roasting hot summer afternoon and you want to look stylish without putting too much effort, this ensemble will do the job in next to no time. When it comes to casual fashion for 20-somethings, this combo is ideal.