Check this site out, it may help you find what you are looking for. You would have to do some altering but it would be a start. Real Ninja costumes, ninja costumes for adults and kids
I also googled assassin costumes and found the costume from assassins creed but it had a price of like $360.00 on it.
I also googled assassin costumes and found the costume from assassins creed but it had a price of like $360.00 on it.