Every term there is a new Class Topic and a dress up day where the whole class is required to turn up to school in costume.
If you're not a crafty Mary Poppins-esque supermum who can produce a hand made costume over a weekend, you are forced to purchase a costume (usually from Amazon in the range of £12-£25).
AIBU to have kept DD off today because I am not a crafty supermum and cannot possibly afford the costume.