Dress up as Rapunzel, your favorite princess.
It is about 18 or 19 inches in circumference designed for a young child. It could be made larger by adding stitches when you cast on stitches for the wig and adding rows to make the wig deeper before decreasing for the crown.
I used large double points with the yarn held double to make the braid thicker. The flowers are made of felt, but you could use buttons or trim flowers.

One skein of Herrschners Worsted 8 has enough yardage to make 2 wigs.
This wig was inspired by the Magic Yarn Project which supplies wigs to children suffering from Cancer. My Belle wig is available on ravelry for free.