If you're looking for the kabuki-styled Ninja equipment, I think you're stuck with AF/Relic and CT gear. If you wanted to go for a "realistic" ninja, I'd recommend any of the low level gathering or crafting stuff.
As an aside not exactly on topic to this thread: Remember, nothing says "hello I am a secret assassin" better than matching uniforms!
As an aside not exactly on topic to this thread: Remember, nothing says "hello I am a secret assassin" better than matching uniforms!