Tweaked the definition to clear the confusion with other tropes. Real Life, at least not without loads of hair gel. There can be many reasons for this, although the most common are either to make the pigtails clear even in long shots, or just plain Rule of Cute. Quite often these pigtails have the hair in a spiral, which overlaps with Princess Curls. A Sub-Trope of Anime Hair, Girlish Pigtails, and Bigger Is Better. Compare/contrast '80s Hair.
Hello, Unknown Troper. You'll need to get known to lend a hand here.