Not a crown

Some friends were over and Buddy boy and his friend made these.  All the kids were playing dress up.  The girls were playing princess so I thought they were making crowns.  No...

the princesses (and one prince in pink)

Does this give you a clue?

Yup, it's a Calvin wig.  He loves Calvin and Hobbes, including their duplicator.  There are days when he wants to be called Duplicate #5, usually when there is something he doesn't want to do.  I'm OK with that.  If the duplicate comes and cooperates it's all good.