The image of the ninja wearing all black is a popular one indeed ,but there is really no evidence that ninjas ever wore such a costume In fact, it is much more likely that ninjas dressed as regular civilians, which would have been far more effective camouflage in most situations than an all-black suit.And while dressed as farmers, ninja carried simple gardening tools (such as sickles or trowels)and used them as deadly weaponry.Ninja often dressed as monks, entertainers, fortune-tellers, merchants, or farmers.