There are a lot of Batman jackets out there, but I think this one from the Official DC Store is pretty amazing! It's made from leather and based on European design and fit, with removable body armor and the Batman logo detailed into the chest. It's a jacket that lets you fly your geek flag, but is stylish and subtle enough you could wear it just about anywhere. 

From the website: 

This Batman Begins Leather Street Jacket is currently available in adult sizes M/L/XL, and retails for $399.95 at the Official DC Store,