Running clothes are so important when you are training for a marathon.
They are as much a part of your health and well-being as stretching and a proper diet.
There are a couple things to keep in mind from the experts.
It's important to find clothes that wick the moisture...meaning when you start to sweat, you won't feel wet. There's an old saying that cotton is rotten when it comes to running. You need clothes that are lightweight and comfortable. Running is a high intensity workout that can produce a lot of sweat, so these clothes need to be made to deal with moisture and work to keep you dry. Look for something that will last.
Your running gear should fit. Your sneakers should be comfortable and fit properly. Shorts or tights should be comfortable. Everyone is different when it comes to how they want their clothes to fit, but running clothes should be breathable and allow for full range of motion. And don't try something new out the day of the race. Just like you are practicing your runs, you should also practice your clothing as well.
One more word of advice, because they are workout clothes, your running clothes will require frequent washing. It is important to wear clothes that can withstand this. The most important thing is your comfort.
*text taken from http://www.cfnews13.com/article/news/2011/april/228061/Importance-of-running-clothes