Women's Halloween Costumes

At SillySanta you'll find over 10 fun women's Halloween costumes – also known as Halloween outfits or fancy dress for women – ready to wear this October. Throw on a matching look for the party, the trick-or-treat walk or the office costume contest! From cuddly onesies like the Devil Onesie and Alien Onesie to the cute Unicorn Onesie and Teddy Bear Onesie, there's a costume for every mood in our collection.

Glam, gory or goofy womens halloween costumes for the perfect girls' night

Every style here is a one-piece onesie, so choosing your look is the fun part, not the stressful part. Go cheeky as a Devil, weird and wonderful as an Alien, or classic with a glow-in-the-dark Skeleton that lights up the moment the bar goes dark. Want a laugh? The Prisoner onesie comes with a writable mugshot board so you can name your "crime" for the night. The Monster onesie is the go-to if you'd rather be silly than scary.

If cute beats spooky in your book, the Unicorn glows in the dark, and our Teddy Bear onesie comes in three colorways – Brown, Grey and Pink – so two friends can match while a third does her own thing. There's no wrong answer, just different moods, which is exactly why these work so well for a group heading out together.

Walk through the styles by mood

• Cheeky: the Devil, for anyone who wants a wink rather than a fright.
• Weird and wonderful: the Alien and the Monster, both more fun than frightening.
• Classic spooky: the Skeleton, which glows in the dark for the full effect.
• Funny: the Prisoner, with its writable mugshot board for a custom gag.
• Cute over scary: the glow-in-the-dark Unicorn and the Brown, Grey and Pink Teddy Bears.

Why a onesie beats a traditional costume

Here's where these win. Most Halloween costumes look fine in the photo and feel awful by the end of the night: stiff, restrictive, and impossible to sit down in. Ours are super-soft onesies you actually move in. You can dance, slump on a sofa, dash out for snacks, and still be comfortable when the party runs long, all in the same outfit, all night. There's no zip digging into your back and no hem to trip over on the walk home.

Getting ready takes seconds too. Legs in, arms in, zip up, done. No last-minute DIY disaster, no fiddly layers, no ill-fitting rented costume that shows up a size off. Depending on the style they're made from soft polyester, recycled polyester or a cotton-polyester mix, and several are proper fleece, so they double as the warmest thing you'll wear all season. If you want to see the full lineup, browse our halloween costumes for the rest of the range.

Mix and match womens halloween costumes with your friends

The best part of dressing up is doing it together, and a onesie group look is genuinely easy to pull off. Everyone grabs their own character and you've got an instant theme, or two friends match in the same Teddy Bear colorway while the rest go their own way. Because no one's squeezed into something uncomfortable, the whole group stays in costume from pre-drinks right through to the last song. Coordinate a full set of monsters, or let everyone pick the style that suits them and call it organized chaos. It's the rare group costume where the planning takes minutes and nobody backs out at the last second.

Fit, fabric and the glow-in-the-dark details

Sizing is straightforward: these are a regular fit, so go with your usual size, and if you're between two, size up for the roomier, comfier feel a onesie is meant to have. For a sense of scale, our models stand between 170 and 186 cm and wear sizes S to L, so you can picture the length before you order.

Fabric varies by design: some are 100% polyester, some recycled polyester, and others a 60% cotton, 40% polyester blend, with a few made up as cozy fleece. Whatever you choose, keep it easy to look after with a gentle machine wash at 30 degrees, inside out, alongside similar colors. A handful of our styles glow in the dark, the Unicorn and Skeleton among them, which is a small thing that gets a big reaction once the lights drop.