A Harry Potter costume is built around a house robe, a wand and a pair of round glasses, with house colours (Gryffindor red, Slytherin green, Hufflepuff yellow or Ravenclaw blue) doing most of the work. Get the robe and colours right and everything else is finishing detail. Below are the pieces that cover kids' house robes, adult versions and the characters beyond the main trio, so you can put together a look for one person or a whole family.
How to get the look: start with a house robe in the right colour, add a wand and glasses to finish the wizard look, pick a specific character version if you want to go beyond a generic robe, then layer in tights, a tie or a wig for the smaller details.
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Kids' house robes
Robes are the fastest way to sort a group of kids into houses, and most come with a wand or glasses already bundled in.
Hogwarts Robe with 4 Interchangeable House Badges
One robe with velcro badges for all four houses, useful if siblings want different houses without buying separate robes.
Slytherin Robe Costume, Age 7-8
A straightforward Slytherin robe in the house's green and silver, a solid low-cost option for a quick school-uniform look.
Character costumes beyond the robe
If you want the look to read as a specific character rather than a generic wizard, these go further than a plain house robe.
Hermione Granger Costume Set with Wig and Wand
A Gryffindor robe bundled with a curly wig and wand, built specifically for a Hermione costume rather than a generic house look.
Deluxe Hagrid Costume, Kids
A bulked-out coat costume for a Hagrid look, a good pick for the one kid in the group who doesn't want to be another robe-wearing student.
Adult Harry Potter costumes
Adult versions run from full character costumes to layered robe-and-accessory sets, so there's an option whether you want a night-out outfit or an office fancy dress day look.
Official Gryffindor Costume Dress, Adult
An officially licensed Wizarding World top and skirt in Gryffindor red and grey, built for adults rather than resized kids' stock.
Official Dumbledore Robe and Hat Outfit
A full silver-grey robe and hat outfit for Dumbledore, the pick for anyone wanting the headteacher look rather than a student robe.
7-Piece Wizard Cape and Accessories Set
A hooded cape with scarf, wand, glasses, tie and hat in one set, an easy full-outfit route without buying a licensed robe.
Putting the look together
If you're dressing a group, split houses before you shop so you're not all in Gryffindor red. Add round glasses and a tie in the house colour for anyone who only has a plain black robe, and save the character-specific costumes (Hermione, Hagrid, Dumbledore) for the people who want to stand out from the crowd of students. For a wider school-uniform theme rather than Harry Potter specifically, browse the World Book Day costumes collection, or check kids' Halloween costumes for more character options.
Shop the look
Shop all Harry Potter fancy dressShop World Book Day costumes
Frequently asked questions
What do I need for a basic Harry Potter costume?
A house robe in your chosen colour, a wand and a pair of round glasses. That combination reads as Harry Potter or a Hogwarts student without any further additions.
What house colours should I pick if I don't have a preference?
Gryffindor red is the most recognisable and the easiest to source, but Slytherin green, Hufflepuff yellow and Ravenclaw blue all work equally well and suit group looks where everyone picks a different house.
Can adults wear the same costumes as kids?
Not usually. Most kids' robes only go up to early teen sizes, so adults need a dedicated adult-sized costume such as the official Gryffindor dress or Dumbledore outfit rather than a resized kids' robe.
How do I dress as a specific character rather than a generic student?
Look for character-specific sets, such as the Hermione costume with wig and wand or the deluxe Hagrid costume, which add details a plain house robe doesn't cover.
Is Harry Potter fancy dress only for Halloween?
No, it's just as popular for World Book Day, school theme days and birthday parties throughout the year, not only Halloween.
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Curated by Halloween Kingdom, updated June 2026. Meet Halloween Kingdom.
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