Batsuit

The Batsuit is Batman's personal crime-fighting superhero costume.

History
When Bruce Wayne was in his study in Wayne Manor he was wondering what would be an effective way to fight criminals. And just then, like an omen, a bat flies through the window. He then realized that a bat is a terrifying creature, and that if he dressed up like a bat, he could strike terror into criminal hearts. During his studies, he learned that criminals were, for the most part, a superstitious, cowardly lot. So he knew he could use that to his advantage.