On an archive binge.
Page 21, Book 2, before the Kingworld spell is cast, Jillian's hat is a shimmery golden top hat.
Page 22, Book 2, after it has been cast, she's wearing some kind of stripy motorbike helmet thing.
Can't believe I never noticed this before. There's no way that's not deliberate on Rob's part - but why? Signamancy? Something to do with Carnymancy and showmanship? Part of the deal with Charlie?
What am I supposed to be reading into it?
Apologies if this has been spotted and discussed before, and there's some sort of really obvious answer.