Couples Halloween costumes: 10 ideas in onesies

The easiest couples Halloween costume to pull off is two hooded onesies that go together: a shark and a crocodile, a pumpkin and its monster, two monsters in clashing colours. They go on in ten seconds, you keep them on all evening and, come 1 November, they're back to being pyjamas. Here are 10 duo ideas, homemade accessories to take it further and the safety rules to keep in mind.

Looking for an outfit for one? Our guide to adult Halloween pyjamas covers the three star characters.

Why go for a couples costume in onesies?

• The duo reads instantly. Two hoods that belong together are all it takes: no need to explain "so what are you meant to be?".
• It suits people who hate fancy dress. No wig, no make-up required: a roomy onesie wears like ordinary clothing.
• Each of you picks your own size. The onesies are unisex and roomy: go by your own height, using the size guide on each product page. Our method for choosing the size of an adult onesie will help if you're unsure.

10 couples Halloween costume ideas

1. The shark and the crocodile

The predator duo. On one side, the Shark Kigurumi in blue flannel, with a padded fin on the back and a shark-jaws hood that makes it look as if you're being swallowed. On the other, the Crocodile Onesie in olive green, with a yellow belly, scales stitched down the back and a tail behind. Sea versus swamp: you decide who bites whom.

2. The pumpkin and its monster

The Halloween theme, for two. The Pumpkin Onesie in orange coral fleece, with its embroidered pumpkin and long-haired monster hood, faces off against the Monster Pyjamas with horns and big embroidered eyes. The friendly pumpkin and the creature lurking nearby.

3. Two monsters, two colours

The Monster Pyjamas come in eight colours: green, blue, red, black, white, yellow, purple or beige. Pick two that clash, green and purple, red and blue, black and white, and there you are: a family of monsters. It's the simplest idea on the list, and one of the most photogenic.

4. The big mouth monster and the monster bunny

For a properly weird duo. The Big Mouth Monster Pyjamas, in cream and sky blue with a wide-open mouth on the hood, team up with the Monster Bunny Faux Fur Pyjamas, with long floppy ears and a single big eye. Worth knowing: the monster bunny is made to order and change-of-mind returns aren't accepted, so double-check the size before you order.

5. The crocodile and the monkey

A jungle duo: the Crocodile Onesie on one side, the Monkey Kigurumi on the other, with its light-coloured snout, big round ears and long tail. The monkey can carry a banana as a prop, and the crocodile can spend all evening trying to steal it.

6. The giraffe and the monkey

For a "haunted zoo" party or a gentler duo. The Giraffe Kigurumi, with orange spots on a cream background, little round horns and a pompom tail, pairs beautifully with the monkey. More cute than scary, ideal if the party also brings in children with their parents.

7. The shark and the castaway

Just one onesie, and a homemade prop for the other. One of you wears the shark, the other makes a castaway outfit: an old striped T-shirt cut into fringes, an inflatable ring around the waist, a bucket hat and some "sunburn" make-up. The shark follows them around all night.

8. The monster hunter and the monster

Same idea: one of you puts on the Monster Pyjamas, the other becomes a hunter with a head torch, a fishing or butterfly net and a notebook reading "Wanted: green creature". To put an outfit together in ten minutes, dip into our list of last-minute costumes.

9. The pumpkin patch

Two Pumpkin Onesies, and a whole vegetable patch turns up. Add a fake "October harvest" label pinned to the front, or a wicker basket for whichever of you plays the gardener.

10. The matching duo for a horror film night

For anyone celebrating Halloween on the sofa. The Family Fleece Onesie comes in women's and men's sizes, with the same animal for both: panda, ginger tiger, brown bear, dinosaur or capybara. It's loungewear rather than a party costume, perfect for a horror film marathon for two under the blanket. Each listing is for a single onesie: add each size to your basket separately.

For more animal ideas, see our animal-themed fancy dress party ideas.

Homemade accessories to finish your duo

The onesie makes the character; a prop tells the story of the duo.

• Something that links the two of you: a ribbon lead between the trainer and the animal, a cardboard fishing rod to catch the shark.
• A sign: "Beware, predators", "Monsters on the loose", "Harvest 2026". A sheet of card and a black marker are all you need.
• Light make-up: a few gill lines for the shark, freckles for the pumpkin. Use make-up made for skin, test it on a small patch the day before and take it off before bed.
• A sweet bucket or a torch: what you hold in your hand often makes the photo.

Safety: fleece, candles and going out after dark

No flames near the onesies. Hoods, wide sleeves and fleece can easily brush a candle on a coffee table. Go for LED candles in pumpkins and lanterns: London Fire Brigade presents flameless candles as a safer alternative, and points out that celebrations involving fancy dress and candles increase the risk of fire (London Fire Brigade, Candles).

Stay visible outdoors. Blue shark, green crocodile, black monster: most onesies are hard to see at night. France's road safety agency, Sécurité routière, advises pedestrians to wear light-coloured clothing and reflective strips whenever visibility is poor (Sécurité routière, being a pedestrian on the road, in French). A torch or a reflective armband does the job, and it goes nicely with the monster hunter.

Mind the hems. If the onesie drags on the floor, roll up the bottoms or tuck them into slippers: dark stairs and trousers that are too long don't mix.

In short

A great couples Halloween costume is two characters that answer each other: the shark and the crocodile, the pumpkin and its monster, two Monster Pyjamas in clashing colours, or one onesie plus a homemade prop for the other. Each pick your own size, add something that links the duo, keep flames well away and take something to be seen outdoors. Every onesie is in the shop.

Cover photo: Rae Byers / Unsplash