I'm probably a curmudgeonly old shite but all this dressing up nonsense. Do they actually discuss why they like the book they are the character of? Some aren't even books because the kid is determined to dress as a Disney princess or a character from a game. It doesn't exactly encourage reading does it?
And then all the stress of creating a costume, not necessarily connected to a favourite book but what can be thought of or is easiest to do.
Why can't a kid take in a favourite book and write a wee story as to why or have a wee discussion about it.