Your blazer/suit jacket/sport coat, or whatever you want to call it, has pockets. These are not decorations. Carefully cut them open (since they are usually sewn shut on a new jacket) and use them!
Remember that clothing, from its origin, was designed for utility. Not only does it cover your nudy parts, but it also keeps you warm, comfortable and holds your everyday nick-nacks. With that said, there is something classy and stylish about a man who knows how to "use" his clothes the way they were designed to be "used". Think of it this way; pants are meant to fit at the waist, which explains why your young hipster cousin looks foolish (and looks like he is trying way to hard to be rebelliously "cool") when he sags his pants down below his ass.
On one of my (and probably also your) favorite street style bogs, The Sartorialist, photographer Scott Schuman frequently shoots his male subjects with their hands in their jacket pockets. See below.
Photo by Scott Schuman
So whether you use them to store your camera or your keys, or just to keep your hands warm as the temperature creeps lower, open up the pockets and get the most out of your jacket.
Yours in style, SB.