The Ninja suit is a costume that makes Bob's sprinting completely silent, allows him to crash through doors without making noise and prevents Dogs from spotting Bob unless he touches them directly. It does not, however, prevent guards from becoming suspicious if Bob bumps into them and offers no protection against Cameras or Lasers.
"With this faux-authentic ninja suit you can pretend to be a real ninja!"
The Ninja suit is available to be bought from the store for 4000 coins, making it the second-most expensive costume in the game (behind the Super-Bob suit which costs 4500 coins).
there is one costume that is the same. one will be Black Hood