Children's Fancy Dress Costumes

There's nothing our little ones love more than dressing up - and boy, are they in for a real treat with OnBuy's collection of fancy dress for kids! Ticking off all the classics alongside a line-up of their favourite characters, our virtual dressing up box is bursting at the seams with fun. Which will you choose?

Showing 1-60 of 41,479 results

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

Looking to buy Children's Fancy Dress Costumes?

Here to transport your little one into a world of imagination is OnBuy's range of fancy dress for kids. Be it for a special event or simply to top up their playtime picks, you'll find the best kids fancy dress selection around on our virtual shelves- we're sure of it! With an array of fantastic children's fancy dress costumes from the likes of Smiffys, Bristol Novelty, and Rubies, finding the perfect kid's costume is only a click away.

Ticking off all the childhood classics (we're talking kids' pirate costumes, kids' princess costumes and of course: kids' superhero costumes), our kids' fancy dress costume edit will leave you spoiled for choice - just don't let the little ones peep or they'll want them all! Finished with an impressive selection of fancy dress outfits for babies too, every little one can join in with the fun at OnBuy.

Top tip: if you're looking for children's fancy dress to refresh their dressing up box without breaking the bank, look to the cheap kids' fancy dress on offer - brimming with bargains, you won't mind if these kids' costumes don't come home in one piece (phew!). For the finishing touch, we even boast a healthy collection of fancy dress accessories that won't break the bank - brilliant!

Customers love our best-selling Children's Fancy Dress Costumes

Popular Brands in Children's Fancy Dress Costumes

deAO Toys
Premier Housewares
Harry Potter
Star Wars
L.O.L. Surprise!
Melissa & Doug
Paw Patrol

Our most popular Children's 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