Onesies

62 products
62 products
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OppoSuits Shadow Onesie showcasing sleek black and gray geometric pattern with a comfortable, full-body fit OppoSuits Shadow Onesie showcasing sleek black and gray geometric pattern with a comfortable, full-body fit
SOLD OUT

Shadow Adult Onesie

$54.99
$54.99
Man and Woman wearing blue pluche Cookie Monster Adult onesie for adults. Standing next to each other, holding hood with hands. Man and Woman wearing blue pluche Cookie Monster Adult onesie for adults. Standing next to each other, holding hood with hands.

Cookie Monster Adult Onesie

$54.99
$54.99
Man and woman wearing purple unisex adult onesie Pokeomon Gengar themed. Both looking at the floor. Man and woman wearing purple unisex adult onesie Pokeomon Gengar themed. Both looking at the floor.

Gengar Adult Onesie

$54.99
$54.99
A man and woman are wearing a green dinosaur adult onesie featuring playful hood details and cozy, soft material, perfect for lounging or costume events. A man and woman are wearing a green dinosaur adult onesie featuring playful hood details and cozy, soft material, perfect for lounging or costume events.

Dinosaur Adult Onesie

$44.99
$44.99
A person wearing a cozy blue and white Snorlax onesie, featuring a hood with Snorlax’s face and ears, and a front zipper with pockets. A person wearing a cozy blue and white Snorlax onesie, featuring a hood with Snorlax’s face and ears, and a front zipper with pockets.
SOLD OUT

Snorlax Adult Onesie

$54.99
$54.99
A man and woman wearing a playful blue and beige Sonic the Hedgehog-themed adult onesie from OppoSuits. The cozy onesie features a zip-up front and an attached hood designed to resemble Sonic’s iconic face, complete with ears and an expressive gaze. The blue body of the suit contrasts with a beige belly, mimicking Sonic's classic look. A man and woman wearing a playful blue and beige Sonic the Hedgehog-themed adult onesie from OppoSuits. The cozy onesie features a zip-up front and an attached hood designed to resemble Sonic’s iconic face, complete with ears and an expressive gaze. The blue body of the suit contrasts with a beige belly, mimicking Sonic's classic look.

Sonic the Hedgehog™ Adult Onesie

$54.99
$54.99
A man and a woman are dressed in a Luigi-themed onesie. The outfit looks as a bright green hoodie with an "L" symbol on the hood and blue overalls with large yellow buttons on the straps. The overall design mimics the look of the popular video game character Luigi, with contrasting green and blue colors. The background is plain, putting focus on the costume. A man and a woman are dressed in a Luigi-themed onesie. The outfit looks as a bright green hoodie with an "L" symbol on the hood and blue overalls with large yellow buttons on the straps. The overall design mimics the look of the popular video game character Luigi, with contrasting green and blue colors. The background is plain, putting focus on the costume.

Luigi Adult Onesie

$59.99
$59.99
A man and woman are wearing a bright red Knuckles the Echidna-themed adult onesie from OppoSuits. The fun and cozy onesie features a zip-up front and an attached hood designed to resemble Knuckles' face, complete with expressive eyes and floppy dreadlocks. The suit is primarily red, with a white crescent pattern on the chest, reflecting Knuckles' iconic look from the Sonic the Hedgehog video game series. A man and woman are wearing a bright red Knuckles the Echidna-themed adult onesie from OppoSuits. The fun and cozy onesie features a zip-up front and an attached hood designed to resemble Knuckles' face, complete with expressive eyes and floppy dreadlocks. The suit is primarily red, with a white crescent pattern on the chest, reflecting Knuckles' iconic look from the Sonic the Hedgehog video game series.

Knuckles Adult Onesie

$54.99
$54.99
Man and Woman wearing red and blue, Unisex Adult Onesie with Super Mario theme. Onesie resembles the Super mario outfit. Man and Woman wearing red and blue, Unisex Adult Onesie with Super Mario theme. Onesie resembles the Super mario outfit.

Mario Adult Onesie

$59.99
$59.99
Boy wearing blue Sonic the Hedgehog Kids Onesie Boy wearing blue Sonic the Hedgehog Kids Onesie

Sonic the Hedgehog™ Kids Onesie

$49.99
$49.99
Smiling child standing front-facing, wearing a red Knuckles onesie with hood up and hands on hips. The onesie features a white chest patch and animated face on the hood. Smiling child standing front-facing, wearing a red Knuckles onesie with hood up and hands on hips. The onesie features a white chest patch and animated face on the hood.

Knuckles Kids Onesie

$49.99
$49.99
Kid wearing Spongebob onesie Kid wearing Spongebob onesie

SpongeBob™ Kids Onesie

$49.99
$49.99
Two people wearing green pixelated onesies designed to look like the Minecraft Creeper character. The onesies have hoods with the Creeper’s iconic black pixel face. The man is holding his hood and looking down, while the women is smiling at the camera with one hand on their hip Two people wearing green pixelated onesies designed to look like the Minecraft Creeper character. The onesies have hoods with the Creeper’s iconic black pixel face. The man is holding his hood and looking down, while the women is smiling at the camera with one hand on their hip

Creeper Adult Onesie

$54.99
$54.99
Man wearing SpongeBob Unisex onesie Man wearing SpongeBob Unisex onesie

SpongeBob™ Adult Onesie

$54.99
$54.99
A man is wearing a vibrant Pikachu onesie, designed to resemble the iconic Pokémon character. This unisex adult onesie is bright yellow with Pikachu’s recognizable face on the hood, featuring large black-tipped ears, black eyes, red cheeks, and a cute smile. The onesie has a convenient front zipper closure and two front pockets for functionality and comfort. The soft, cozy material makes it perfect for lounging, cosplay events, or Pokémon-themed gatherings. Ideal for Pokémon fans. A man is wearing a vibrant Pikachu onesie, designed to resemble the iconic Pokémon character. This unisex adult onesie is bright yellow with Pikachu’s recognizable face on the hood, featuring large black-tipped ears, black eyes, red cheeks, and a cute smile. The onesie has a convenient front zipper closure and two front pockets for functionality and comfort. The soft, cozy material makes it perfect for lounging, cosplay events, or Pokémon-themed gatherings. Ideal for Pokémon fans.

Pikachu Adult Onesie

$54.99
$54.99
Two people wearing matching orange and yellow Pokémon Charmander onesies on a grey background Two people wearing matching orange and yellow Pokémon Charmander onesies on a grey background

Charmander Adult Onesie

$54.99
$54.99
A man is wearing an adorable Eevee onesie, modeled after the beloved Pokémon character. This adult unisex onesie is designed in a warm brown color, resembling Eevee’s fur, and features a fluffy beige collar mimicking Eevee’s mane. The hood includes Eevee's signature large brown ears, big black eyes. The onesie has a front zipper closure and convenient pockets at the front, offering both comfort and ease of wear. Perfect for Pokémon fans. A man is wearing an adorable Eevee onesie, modeled after the beloved Pokémon character. This adult unisex onesie is designed in a warm brown color, resembling Eevee’s fur, and features a fluffy beige collar mimicking Eevee’s mane. The hood includes Eevee's signature large brown ears, big black eyes. The onesie has a front zipper closure and convenient pockets at the front, offering both comfort and ease of wear. Perfect for Pokémon fans.

Eevee Adult Onesie

$54.99
$54.99
A man and a woman are dressed in a red Elmo-themed onesie. The overall design mimics the look of the Sesame Street character Elmo. The background is plain, putting focus on the costume. A man and a woman are dressed in a red Elmo-themed onesie. The overall design mimics the look of the Sesame Street character Elmo. The background is plain, putting focus on the costume.

Elmo Adult Onesie

$54.99
$54.99
Kid is wearing a red onesie resembling Elmo. He has his right hand in his pocket. Kid is wearing a red onesie resembling Elmo. He has his right hand in his pocket.

Elmo Kids Onesie

$49.99
$49.99
A kid is wearing a blue sesame street onesie resembling Cookie Monster. A kid is wearing a blue sesame street onesie resembling Cookie Monster.

Cookie Monster Kids Onesie

$49.99
$49.99
A child wearing a red and blue Mario onesie with a hood, resembling the famous video game character. A child wearing a red and blue Mario onesie with a hood, resembling the famous video game character.

Mario Kids Onesie

$49.99
$49.99
Child wearing a green and blue Luigi onesie with a hood on a white background Child wearing a green and blue Luigi onesie with a hood on a white background

Luigi Kids Onesie

$49.99
$49.99
Man wearing orange onesie Man wearing orange onesie
SALE

The Orange Adult Onesie

$41.99
$41.99
Man wearing Navy blue onesie Man wearing Navy blue onesie
SALE

Navy Royale Adult Onesie

$29.99
$29.99
Man wearing grey onesie Man wearing grey onesie
SALE

Gentle Grey Adult Onesie

$35.99
$35.99
Man wearing a multicolor onesie Man wearing a multicolor onesie
SALE

CrissCrosser Adult Onesie

$35.99
$35.99
Man wearing jaguar/ panther print onesie Man wearing jaguar/ panther print onesie
SALE

The Jag Adult Onesie

$35.99
$35.99
Man wearing black onesie with yellow smiley print Man wearing black onesie with yellow smiley print
SALE

Smiley Original® Adult Onesie

$20.99
$20.99
Man wearing blue Christmas onesie Man wearing blue Christmas onesie
SALE

Festivity Blue Adult Onesie

$29.99
$29.99
man wearing green onesie man wearing green onesie
SALE

Glorious Green Adult Onesie

$35.99
$35.99
A kid wearing a plush black kids onesie inspired by the popular hedgehog character Shadow, featuring spiky red and black accents on the hood, a white chest emblem, and yellow wrist details. The onesie is made from soft fleece material, offering comfort and a playful design for cosplay, lounging, or themed events. The person smiles while the hood is on his head. Perfect for fans of gaming or animated characters. A kid wearing a plush black kids onesie inspired by the popular hedgehog character Shadow, featuring spiky red and black accents on the hood, a white chest emblem, and yellow wrist details. The onesie is made from soft fleece material, offering comfort and a playful design for cosplay, lounging, or themed events. The person smiles while the hood is on his head. Perfect for fans of gaming or animated characters.

Shadow Kids Onesie

$49.99
$49.99
A smiling man and woman are wearing a brown and yellow adult onesie designed as a giraffe. The onesie features a hood resembling a Giraffes head, and giraffe details, perfect for cozy lounging or costume parties. A smiling man and woman are wearing a brown and yellow adult onesie designed as a giraffe. The onesie features a hood resembling a Giraffes head, and giraffe details, perfect for cozy lounging or costume parties.

Giraffe Adult Onesie

$44.99
$44.99
A man and women are wearing a grey and white lemur adult onesie featuring playful hood details and cozy, soft material, perfect for lounging or costume events. Including black and white tail. The hood are on their heads. A man and women are wearing a grey and white lemur adult onesie featuring playful hood details and cozy, soft material, perfect for lounging or costume events. Including black and white tail. The hood are on their heads.

Lemur Adult Onesie

$44.99
$44.99
A man and women are wearing a bright red lobster-themed adult onesie featuring playful hood details and cozy, soft material, perfect for lounging or costume events. including stitched gloves as claws. Both are wearing their hood on their heads. A man and women are wearing a bright red lobster-themed adult onesie featuring playful hood details and cozy, soft material, perfect for lounging or costume events. including stitched gloves as claws. Both are wearing their hood on their heads.

Lobster Adult Onesie

$44.99
$44.99
A smiling man and a woman are wearing a brown adult onesie designed as an otter. The onesie features a hood with ears, a cute face, and playful otter details, perfect for cozy lounging or costume parties. A smiling man and a woman are wearing a brown adult onesie designed as an otter. The onesie features a hood with ears, a cute face, and playful otter details, perfect for cozy lounging or costume parties.

Otter Adult Onesie

$44.99
$44.99
A man and women are wearing an orange adult onesie designed as a red cat onesie. The onesie features a hood resembling a cat's head, and cat details, perfect for cozy lounging or costume parties. Both have the hood on their head. A man and women are wearing an orange adult onesie designed as a red cat onesie. The onesie features a hood resembling a cat's head, and cat details, perfect for cozy lounging or costume parties. Both have the hood on their head.

Red Cat Adult Onesie

$44.99
$44.99

OppoSuits offers a wide range of onesies for adults and kids in officially licensed character designs, animal prints, holiday themes, and solid colors. Whether you're looking for loungewear, a Halloween costume, or a statement outfit for a party, every onesie features soft, comfortable fabric with zip closure and ribbed cuffs. Machine washable and available in adult and kids sizes with free US shipping on orders over $50.

WHAT IS A ONESIE?

A onesie is an all-in-one jumpsuit made from soft material that covers the arms and legs in a single piece. Originally designed as a comfortable alternative to traditional pajamas, onesies have become popular as loungewear, party costumes, and everyday cozy wear. OppoSuits onesies come in printed, character, and solid color designs with features like pockets, drawcord hoods, and zip closures.

CHARACTER ONESIES

Our officially licensed Character Onesies include designs from Pokémon (Pikachu, Charmander, Eevee, Gengar), Sonic the Hedgehog, Super Mario (Mario, Luigi, Bowser, Yoshi), Sesame Street (Cookie Monster, Elmo), SpongeBob, Teenage Mutant Ninja Turtles, and more. Every licensed onesie features authentic character details, accurate colors, and official branding.

ADULT ONESIES

Browse our full Printed Unisex Onesies collection for the complete adult range. These are unisex designs that fit both men and women. Styles range from bold printed statement pieces and color block designs to neutral options with pockets and drawcord hoods. Popular for Halloween costumes, themed parties, cozy nights on the sofa, and as a comfortable upgrade from traditional pajamas.

KIDS ONESIES

Many of our most popular designs are available in kids sizes, including Pokémon, Super Mario, Sonic, and Sesame Street. Great for matching parent-child outfits at Halloween, holiday parties, and themed birthday events.

ONESIES FOR EVERY SEASON

OppoSuits onesies work year-round. Fleece and heavier fabric options keep you warm and cozy during fall and winter nights, while lighter designs work for lounging in warmer months. Holiday onesies in Santa, reindeer, elf, and festive prints are a seasonal staple for ugly sweater parties, Christmas morning, and family gatherings. Looking for a holiday suit instead? Check out our Christmas Suits.

HALLOWEEN ONESIES

Onesies are the easiest Halloween costume. Zip into a character onesie, skeleton print, or spooky design and you're done. They're comfortable enough to wear all night, warm enough for trick-or-treating outdoors, and machine washable the next morning. No assembly, no accessories, no stress.

ANIMAL AND NOVELTY ONESIES

Animal onesies and novelty prints are a go-to for costume parties, group events, and lounging at home. Designs include classic animals with hood details and character-specific touches, plus abstract and novelty patterns for a more playful look.

FREQUENTLY ASKED QUESTIONS

What character onesies does OppoSuits offer?

The collection includes officially licensed onesies from Pokémon, Super Mario, Sonic the Hedgehog, Sesame Street, SpongeBob, Teenage Mutant Ninja Turtles, PAC-MAN, Harry Potter, Batman, and more. All feature authentic character details and official licensing.

Are OppoSuits onesies good for lounging?

Yes. OppoSuits onesies are made from soft, comfortable fabric and designed as a cozy alternative to traditional pajamas. Features like zip closure, ribbed cuffs, pockets, and drawcord hoods make them ideal for relaxing at home, binge-watching, or sleeping in.

Do onesies come in adult sizes?

Yes. OppoSuits onesies are available in both adult and kids sizes. Check the size chart on each product page for specific measurements. If you're between sizes, go with the larger option for a more relaxed fit.

Are onesies machine washable?

Yes. All OppoSuits onesies are machine washable at low temperatures. They hold their print quality and shape through multiple washes.

Can I use a onesie as a Halloween costume?

Absolutely. Character onesies are one of the most popular Halloween costume choices because they're a single zip-up piece, comfortable all night, warm enough for outdoor trick-or-treating, and reusable year after year.