A shirt jacket and light blue jeans are an easy way to infuse effortless cool into your casual styling repertoire. Throw a pair of brown dress boots in the mix to immediately ramp up the fashion factor of any ensemble. Keep this outfit in your front hall wardrobe when spring sets it, and we guarantee you'll save a lot of time trying to pick out what to wear on more than one occasion. And if we're talking dressing ideas for guys in their thirties, this getup looks great on almost anyone.