Kids' Halloween Costumes

At SillySanta you'll find over 15 kids Halloween costumes – also known as kids' fancy dress or children's dress-up outfits – rated 4.9 out of 5 based on over 90 reviews. Get the whole crew in character for trick-or-treating and class parties! From the Kids' Skeleton Halloween Onesie and a fierce Kids' Devil Onesie to playful picks like the Dinosaur and Unicorn Onesies, there's a costume for every little one in our collection.

The comfiest kids halloween costumes you'll find all year

Most fancy dress is stiff, scratchy and good for one night only. Ours isn't. Every costume here is a proper onesie, cut from super-soft fleece so it feels gentle on little arms and legs from the first wear. A few styles are a cotton mix, and the teddy bear ones use a soft teddy fleece with a bit of stretch that the kids say feels like a giant hug.

That softness does a real job on Halloween night. The cozy fleece keeps your child warm through a whole evening of doorbells and dark sidewalks, so there's no fight over a coat that hides the costume. They can run, climb and spin in it too, because a onesie moves the way a child actually moves. Warm, comfy and ready to go all evening, with nothing to itch or pinch.

The fun styles to choose from

There's plenty to pick from, and the favorites do the talking. Little ones love the Kids' Dinosaur Onesie for a friendly roar, while the Kids' Unicorn Onesie brings a bit of magic. The teddy bear range comes in brown, gray and pink, so siblings can each have their own. For the ones who like a fright, there's the devil, an alien and a monster, plus a chicken onesie that crosses over nicely for spring too.

Because they come in so many colors and characters, kids can match up with their friends or pick something all their own. Two sisters in matching teddy bears, a little group of glow-in-the-dark skeletons heading down the street together, or one of each, it's easy to put together without anyone feeling left out. If you want to dress up the wider family as well, our full range of halloween costumes has styles to coordinate the whole household.

The glow-in-the-dark skeleton

One style earns its own mention. The Kids' Skeleton Halloween Onesie genuinely glows in the dark, so the bones light up the moment you turn off the lights. Kids think it's brilliant, and there's a practical upside too: a child who glows is far easier to spot on a dim street, which is no small thing when you're trick-or-treating after dark. It's the kind of costume that gets switched on at sleepovers long after October is over.

No-fuss kids halloween costumes, zero DIY required

This is where a onesie really earns its place. No sewing machine, no face paint, no half-finished costume the night before. You unzip it, your child steps in, you zip it back up, and that's the costume sorted. It's the easy answer to the homemade route, and it saves the whole evening from turning into a craft project.

The front zip matters once you're out, too. It's simple enough that most kids can manage it themselves, so a quick bathroom trip doesn't mean a parent wrestling with buttons and ties in a cold doorway. They zip down, they zip back up, and you're back to knocking on doors. There's nothing to pin, tie or reattach halfway through the evening, and nothing to lose along the way. Little touches like that are why these costumes are so easy to live with on the night.

Made to wear again, not just on Halloween

The best part comes after the 31st. These aren't one-night costumes you stuff in a drawer. They're real onesies your child will reach for on chilly evenings, at sleepovers, on movie nights and lazy weekend mornings. A dinosaur or a teddy bear has a long life well beyond Halloween, which makes the whole thing far better value than a costume worn once and forgotten.

So you get the dress-up fun on the night and a cozy everyday onesie for the months that follow. Have the camera ready for the trick-or-treat photos, then enjoy seeing the same costume turn up again on the sofa come December.