To let my son wear a fairy dress for his birthday party?

[VoldermortIsTopOfMyLaminateLis]

He's 3 soon. We are having a party for his cousins and 5 nursery friends, and all he's talked about for a week is wearing his fairy outfit for the party! Personally, I don't mind what he wears, but MIL is going apeshit! Wwyd?

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yes, by the time everyone on mumsnet is doing it, it is well on its way out as a trend i am afraid