A grey long sleeve t-shirt and jeans are the kind of a no-brainer casual combo that you so desperately need when you have zero time. Want to dial it down when it comes to footwear? Complement this outfit with a pair of black leather work boots for the day. When it's one of those dreary fall days, sometimes only a cool outfit like this one can get you to face the outside world. Ideal if you're looking for some incredibly inspiring casual style for 20-something guys.