The 'bun' has been around since the Italian Renaissance courts of the 15th century, but can also be traced back to ancient Greece where women would wear their hair in a 'Greek knot' low at the back of the neck. The bun would be adorned with jewels and would be a symbol of wealthy Greek women. Since then, the bun has been a staple image of the ballerina. Wearing hair in a clean, tidy bun shows respect not only for how a dancer looks but also for the art form itself. And of course it helps when you're practising all your spinning and pirouettes!
You can purchase all the items you need for a bun from any drugstore like Boots. These include a hair tie, bun net and pins.
Watch how a ballet bun is done properly in this clip: