British culture is an amalgamation of the cultures which make up the nation - including those who immigrated here, were invited, were colonised, invaded, were merged, absorbed or adopted or just stolen from other countries.

Even national characteristics are largely too broad - the UK is not the only country with a love of animals and fair play or even the only one which likes tea and queing.

So the basketball costume - which you're stuck with, knowing 8 year olds - is valid. You can try to make it a British team or have the ball as a globe if you want him to look like a political cartoon about colonialism.

A representative British costume could be a patchwork - or just pick any historical period within our national mythmaking - King Arthur, Boudiccia, Elizabeth Fry, Turing, Byron, Austen, Nightingale, etc but that's more a Great Briton.

A flag tshirt covered in blood/chicken tikka stains and a swag bag full of stolen objects?