On my forum we were discussing the importance of dressing sexy. In this thread, one guy, discuss, posted two pictures that illustrate very well how much your appearance changes if you put on clothes that show off your body. It's one thing to talk about it, but quite another when you see it on pictures.
First, we have some dude who looks rather average. He wouldn't really stand out. Heck, you can't even tell what his body is like. You'll be very surprised when you see the second picture of him, though.
...but now look at this picture: