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A marathon is a long way to run, and if you have a cold and/or rainy race day, it helps to have an extra layer for the first mile or two until you warm up.
Even in ideal weather, you can get chilly waiting around before the start if you are planning to race in a singlet and shorts.
Everyone has an old t-shirt or two that they aren't sentimental about. Bring one of those old t-shirts, wear it on top of your race shirt for a mile or two, and then drop it at a convenient water stop. Many major marathons collect runners' throwaway clothes and give them to charities.
If it is cold and/or rainy, my favorite throwaway clothing is a large garbage bag. Punch holes for your head and arms, and you have a great disposable windbreaker.
But here's the catch; just make sure you have your race number pinned to a shirt that you are committed to wearing, even if it is temporarily covered by another shirt or a garbage bag. You don't want to worry about pinning or unpinning your number during the race.