DD1 (4) has been invited to a birthday party which had invitations with a 'Frozen' theme. She was looking forward to wearing her Elsa dress, which she loves. Today I got a text from the mum (sent to all the guests) saying that they are welcome to wear fancy dress but that the birthday girl will be dressed as Elsa. Is this a roundabout way of saying no one else should wear an Elsa dress? Would it be really bad form to let DD1 wear her Elsa dress or is the mum being a bit precious?