Adult Fancy Dress Costumes

Welcome to OnBuy's adult fancy dress costumes collection! No matter the occasion, with an array of fancy dress for men stacked up alongside fancy dress for women, you're bound to find your new can't-party-without costume here - not quite convinced? Read on to find out more!

Showing 1-60 of 40,675 results

Sort By:
  • Popularity
  • Average Rating
  • Price (highest)
  • Price (lowest)
  • Newest

Looking to buy Adult Fancy Dress Costumes?

Adult fancy dress genres

Maybe it’s late October, and all-hallows eve approaches, maybe you’re going to a fancy dress stag or hen party or perhaps it’s a friend’s birthday party and they want you to dress up - either way, you need a fun outfit to fit in, and OnBuy’s selection of adult fancy dress costumes is exactly what you’re looking for! This fabulous category proves that dressing up isn’t just for kids.

The massive variety of adult fancy dress outfits that our sellers are offering will surprise and delight even the most jaded fancy dress party goer. If it’s a horror-themed party you’re going to, we have dozens of creepy costumes that’ll spook your friends. From killer clowns to werewolves to radioactive zombie ghouls, we’ve got something for every palette.

The flip side of horror is comedy, so let’s examine a few comedic adult fancy dress costumes. Some of the most prominent in this genre are historical costumes. Dress up as a French noble from the 18th Century (just be careful not to lose your head!) a pirate or a Roman Centurion. A popular sub-type of historical outfits are what we’ll call ‘decade costumes’, that is get-up that evokes the fashion and feel of a particular decade. Unveil your wild-child as a 60s hippie, or get smart and upwardly mobile with an 80s yuppie costume. These caricatures go down a treat at any party.

Licenced adult fancy dress costumes

Whether you want a quick and easy costume for a fancy dress party or want to use a costume as the base of your next convention cos-play, our range of officially licenced fancy dress costumes for adults will go down a treat! We have dozens of great costumes from film, TV, novels, Japanese anime and more! Each of these fancy dress get-ups is designed to be as accurate to the character’s costume as possible. With with plenty of well-known properties like Star Wars, Star Trek and more Disney alongside more obscure cult classic costumes, our collection is absolutely certain to get you into character.

As well as fictional characters, the adult fancy dress costumes on sale courtesy of our fantastic sellers include brilliant costumes based on real life pop culture heroes from across the decades. Just like our retro fashion-inspired costumes, these outfits are instantly recognisable and great for themed parties. Dress up as pop star chameleon David Bowie in one of his many incarnations, or glam up as one of the Spice Girls - posh, sporty or scary? It’s your choice!

Customers love our best-selling Adult Fancy Dress Costumes

Popular Brands in Adult Fancy Dress Costumes

Harry Potter
Liverpool FC
Star Wars
Melissa & Doug
Toy Story

Our most popular Adult Fancy Dress Costumes

Delivery Address

Sign in to view all of your delivery addresses


Enter your delivery address


Wait! You've left
something behind...

You'll only get instant Cashback at OnBuy! Enter your email below and we'll send you a copy of your basket to save you time later.

No thanks, I'm alright for now

By entering your email address, you'll automatically be added to our database, where you can enjoy personalised Cashback offers and early access to our best deals. You can opt out of our emails at any time and we'll never share your details with anyone. Check our Privacy Policy and T&Cs to find out more.


Before you go...
Remember, you'll only get instant Cashback on everything at OnBuy!

Want access to personalised offers and the highest Cashback rates? Sign up to our emails below.

No thanks, I'm alright for now

You can opt out of our emails at any time and we'll never share your details with anyone. Check our Privacy Policy and T&Cs to find out more.

This page has expired.

Please refresh the page to continue shopping.

Refresh and continue