Looking more Japanese?

Strangely enough, I was recently mistaken for a Japanese as I stood on the platform waiting for the train. I heard a woman speaking to me in Japanese, and when I turned around she had the most shocked look on her face! She immediately backed away and darted over to someone who really was Japanese, to ask her question.

The number of redheads in Japan has grown to unbelievable proportions, so why wouldn't I have been mistaken for a Japanese woman? It seems that red hair has now become so popular that it probably outnumbers black hair, at least among women, although it also seems quite popular with young men. And, if not red, there's also the blondes, and one Japanese guy even had blue contact lenses and platinum blonde hair. He looked like an alien!