You may know Rapunzel from the Disney movie Tangled or from the story by The Brothers Grimm-but it is a classic. Who has more famous hair than Rupunzel? This cosplayer depicts her in her Tangled costume.
Obviously the most important part of this costume is tons of hair. I am not sure the rest of the costume matters. Ha! But if you want to look like the Disney princess you can get the look here for adults or here for kids.