Unless you are in an actual race while being sponsored by the Post Office or another company like the professional riders are, what is the point? If I play a game of basketball, throw a football or a baseball I dont wear a complete outfit. Please other than the same argument that you have pockets to put stuff in or it wisks away sweat If that were the case you could wear a t-shirt over it. If someone can actually admit that they do it to feel cool or part of a team or a better reason, I will award the best answer and respect you for your honesty. I will also admit this drives me crazy for no reason.