This combination of a grey gilet and a light blue long sleeve shirt makes for the ultimate off-duty style for any modern gentleman. You can get a little creative with footwear and introduce dark brown suede derby shoes to your outfit. Keep this ensemble in your head when spring comes, and we guarantee you'll save a lot of time racking your brain for what to wear on more than one morning. This combo illustrates how to remain fashionable as you reach your 40s.