Okay, first you need a blazer. (Mine doesn't help because it's the weirdest colour ever. D: )
And then you need some glasses.
And then you need to put a face on that makes you look like a filmstar who is really cool (generally raising one eyebrow and making a cocky face makes you look like a big enough douchebag).
And voila, you are a shoddily done spy.
Simples.