The Union Jack pyjama is an iconic part of British history, originating in the 19th century as a symbol of British naval power. It was originally used as a flag to identify British ships in the Mediterranean.
Today, the Union Jack pyjama is still worn by British sailors, but also has become a popular symbol of British nostalgia and kitsch.
In fact, it's become so popular that it's now been featured on everything from mugs to t-shirts.
And if you're feeling particularly patriotic, you can even buy a Union Jack pyjama for yourself! Just don't forget to pair it with a pair of Union Jack socks, or the whole look will be ruined.