Superstition does exist, because it's in the minds of the individuals who hold them.
Luck also exists. It just isn't influenced by the color of your shirt, socks or underwear. Those things may give you some confidence in the final outcome. Placebos (sugar pills) have been shown to have some effect in treating various ailments. This is due to the person believing they will work. But they don't really do anything. Your "lucky shirt" makes you feel better, but has less effect than a placebo.
Ask me, and I will say we were "lucky" when Stoerner fumbled the ball in '98, disregarding that Billy Ratliff pushed the guard that caused Sterner to stumble and fumble. In my mind, it was still a lucky play, for all those things to happen as they did.
Sorry, I couldn't resist.