Every October, otherwise perfectly sensible adults paint themselves green, put on vampire teeth or spend an evening dressed as a six foot skeleton. Children knock on doors dressed as ghosts, witches and monsters, while pumpkins glow from windows and gardens.
We are so familiar with Halloween that it is easy to forget how unusual some of its traditions actually are.
Why do we dress up? Why are ghosts and witches everywhere? Where did trick or treating come from? And how did a celebration associated with the dead eventually become one of the biggest fancy dress occasions of the year?
There is no single answer. The Halloween we celebrate today developed over many centuries, shaped by seasonal festivals, Christian observances, folklore, community traditions and, eventually, films, television and popular culture.
Where Did Halloween Come From?
The story of Halloween stretches back hundreds of years and involves traditions from several different periods.
One of the celebrations most often connected with Halloween is Samhain, a festival observed in parts of the ancient Celtic world around the beginning of November. It marked an important point in the seasonal calendar, as the harvest ended and winter began.
This time of year became associated with darkness, the changing seasons and beliefs surrounding the supernatural. Accounts of Samhain and later folklore have helped create the connection between this period and spirits or the dead.
However, it is a little too simple to say that modern Halloween is simply Samhain with a new name. The celebration we recognise today developed through a mixture of older seasonal customs and later Christian traditions.
From All Hallows' Eve to Halloween
Christian observances also became an important part of the story.
All Saints' Day, traditionally celebrated on 1 November, commemorates saints and holy figures. The evening before became known as All Hallows' Eve. Over time, that name developed into the word we now know as Halloween.
All Souls' Day followed on 2 November and was associated with remembering the dead. Customs connected with these days developed alongside existing local traditions across Britain and Ireland.
Rather than Halloween having one clean starting point, it is better understood as something that evolved. Religious observances, folklore and seasonal customs influenced one another over generations.
Why Do We Celebrate Halloween?
Today, most people celebrating Halloween are probably thinking more about sweets, parties and costumes than ancient seasonal festivals.
That is because the meaning of Halloween has changed considerably.
Older traditions surrounding the changing seasons and remembrance of the dead gradually became mixed with community celebrations, games, storytelling and mischief. Irish and Scottish communities also carried Halloween customs with them when large numbers emigrated to North America during the nineteenth century.
There, Halloween continued to develop into a more recognisable modern celebration, particularly during the late nineteenth and twentieth centuries.
Parties became more common. Children took an increasingly prominent role. Pumpkins, costumes and door to door traditions became firmly established. Eventually, popular culture transformed Halloween again.
That long evolution is why Halloween can feel like several celebrations rolled into one. It is spooky, social, theatrical and slightly ridiculous at the same time.
So, Why Do People Dress Up for Halloween?
Dressing up has surprisingly deep connections with Halloween's history.
Disguises and masks have appeared in celebrations associated with this time of year for centuries. Traditions varied considerably from one place and period to another, so there is no single moment when somebody decided that everyone should wear a costume on 31 October.
Instead, several customs appear to have contributed.
In Scotland and Ireland, a tradition known as guising involved people disguising themselves and visiting homes. Children might sing, perform or recite something in return for food, fruit, nuts or coins.
Other traditions involved people dressing as supernatural figures or concealing their identities with simple disguises and masks.
This is rather different from deciding which film character to become for a Halloween party today, but the basic idea of temporarily changing your identity has survived remarkably well.
From Guising to Trick or Treating
The history of trick or treating is another example of several traditions eventually coming together.
During the medieval period, a practice often referred to as souling involved poorer people visiting homes and receiving food in return for prayers for the dead. Later guising traditions in Scotland and Ireland also involved visiting houses while disguised and performing for a reward.
These customs were not exactly the same as modern trick or treating, but it is easy to recognise some familiar ingredients: costumes, visiting neighbours and receiving food.
As Halloween developed in North America, going from door to door became increasingly associated with children. By the twentieth century, trick or treating had become one of Halloween's defining traditions.
The performance might have disappeared, but the costume and the reward remained.
Why Are Witches, Ghosts and Skeletons Associated With Halloween?
Walk into almost any Halloween party and you are likely to meet a few familiar faces.
Witches, ghosts, skeletons, vampires, devils and other supernatural characters have become part of the visual language of Halloween.
Some connections are easy to understand. A festival long associated with death, spirits and the supernatural naturally lends itself to ghosts and skeletons.
Witches have centuries of folklore behind them, while literature, theatre and eventually cinema helped turn characters such as vampires into instantly recognisable monsters.
Other favourites arrived later. Zombies, for example, owe much of their modern Halloween popularity to twentieth century horror cinema.
What is interesting is how persistent these characters have been. Halloween fashion changes every year, but a witch hat, skeleton or pair of vampire fangs still makes immediate sense.
When Did Halloween Costumes Become More Like the Ones We Wear Today?
For a long time, Halloween disguises were largely homemade. The objective was often simply to look strange, frightening or unrecognisable.
That started changing significantly during the twentieth century.
Commercially produced Halloween costumes became increasingly accessible, particularly during the middle of the century. Rather than simply hiding behind a homemade mask or sheet, children could dress as recognisable characters.
Halloween costumes also started reflecting entertainment and popular culture.
Monsters remained popular, but they were joined by superheroes, cowboys, film characters, television personalities and eventually almost anything people could recognise.
Horror cinema had an especially strong influence. Monsters that once belonged to folklore or literature became visual icons, while newer film villains created an entirely different generation of scary Halloween costumes.
Today, that connection with entertainment is even stronger. Modern officially licensed costumes allow people to recreate characters from films, television programmes, games and other parts of popular culture in a way earlier generations could hardly have imagined.
What About Pumpkins?
Of course, costumes are only part of Halloween's strange collection of traditions.
The carved jack o' lantern has become one of its most recognisable symbols.
Before pumpkins became closely associated with Halloween in North America, people in Britain and Ireland carved vegetables including turnips. Irish immigrants arriving in America found pumpkins larger and much easier to carve.
The pumpkin eventually became inseparable from Halloween imagery, appearing in decorations, films, party themes and even pumpkin costumes.
Few vegetables have enjoyed such an impressive career change.
Halloween Costumes Today
Modern Halloween would probably be unrecognisable to somebody celebrating several centuries ago, but there are still some familiar threads running through it.
We continue to disguise ourselves. We still tell stories about monsters and spirits. Children still travel from house to house hoping to come back with food.
The major difference is choice.
Today's Halloween costumes and accessories can range from traditional ghosts and vampires to elaborate film characters, inflatable outfits, pop culture references and costumes based on whatever has captured people's imagination that year.
Children have their own enormous range of Halloween costumes, while adults have turned Halloween into a major social occasion in its own right.
The details have changed, but the appeal of becoming someone or something else for an evening clearly has not.
Why Does Dressing Up Still Matter?
Perhaps part of Halloween's longevity comes from the fact that dressing up removes some of the normal rules.
For one night, being ridiculous is encouraged.
You can become something frightening, something funny, a favourite character or something nobody else at the party understands until you explain it three times.
Children get to play at being monsters. Adults get permission to do exactly the same thing.
That sense of transformation connects modern fancy dress with something much older. The reasons for disguising ourselves have changed, but putting on a mask or costume still allows us to step briefly outside everyday life.
If the traditional side of Halloween appeals to you, take a look at our 10 classic Halloween costume ideas, covering characters that have survived changing trends and remain instantly recognisable every October.
A Tradition That Keeps Changing
There was no single day when Halloween suddenly became the celebration we know today.
It grew gradually.
Seasonal customs met religious observances. Stories about spirits mixed with local folklore. Guising, souling and other door to door traditions changed over time. Immigration carried customs across the Atlantic. Community parties grew, costumes became commercial products and popular culture supplied an endless stream of new characters.
Even Halloween's calendar continues to inspire new traditions. In recent years, fans have embraced celebrations such as Summerween, which we explore in our article on the history of Halloween in summer.
Yet after all those changes, one of the oldest ideas remains at the centre of the celebration.
When Halloween arrives, we disguise ourselves.
These days it is less about avoiding spirits and more about deciding whether this is finally the year you can convince your friends to coordinate a group costume. But after centuries of changing traditions, dressing up remains one of the things that makes Halloween feel like Halloween.
Explore our full range of Halloween costumes and accessories for everything from classic monsters to modern characters, masks, makeup and fancy dress accessories.