Ninja Clothing can be used for various purposes. Although its best use is for being a shneaky ninja and doing super cool stuff that no one will see - because you are a ninja of course.
Nowadays hipster trends will allow to wear ninja clothes and go to Penneys or Lidl without anyone noticing.
If you were to go on a secret ninja mission at night this is a preview of how you would look like:
(A ninja portrait at night.)