Pigtail appeal theory

So what exactly makes the pigtail hairstyle so appealing? My guess is that most people would answer this question by saying that pigtails make a woman look like a little girl, suggesting youth and innocense. While this may be (partly) true, one must realise that pigtails also lead to increased cuteness in little girls. Hence, there must be more to pigtail appeal than merely the little girl association.
On this page I will try to identify each possible aspect of pigtail appeal. No doubt, the importance of each of these factors is different for every pigtail admirer. If you think I have overlooked any significant details, please tell me about it. I am very interested in your response!