We’ve got 11 of them thanks to these nostalgic Sunderland Echo archive photos of princesses at Mill Hill Primary School and pirates at Thorney Close Primary, both in 2006.
There’s cheerleaders at Hill View Infants in 2009 and a vampire at St John Boste RC Primary 17 years ago.
It’s a day when fun, education and dressing up all come together.
And it’s a day when you get the chance to re-live these chapters in history.
5. A great read at Eppleton Primary
We deduct that this is a young Poirot and a Paddington-loving pal at Eppleton Primary School in 2010. Photo: se
6. Over at Usworth Primary
What a line-up at Usworth Primary School in 2006. It's a feast of faces but is there one you recognise? Photo: DA
7. Super at St John Boste
Vikings, Action Man, princesses .... what more could you want from World Book Day at St John Boste RC Primary in Washington in 2006. Photo: KB
8. Thrilling at Thorney Close Primary
Fabulous costumes from the staff and pupils at Thorney Close Primary School in 2006. Photo: KB