The school has a mania for dressing up at every opportunity. DS hates change, especially to clothes.
So I give you:
Harry Potter 
school uniform plus biro scar, glasses and a stick
With recycled star wars obsession darth vader cloak
First ever book day/ own clothes day / house colours day/ Easter bonnet day/ Olympic kit day/ sports day / etc
without meltdown from DS (and usually me too
)