Onesies for Adults & Kids | Character & Printed

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Two models wearing matching light purple and purple plush onesie pajamas with Mewtwo hood details, shown against a plain light gray background.

Ghost Face® Onesie Adult Onesie

$54.99

(No reviews)

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

My Little Pony™ - Bluebelle Onesie Adult Onesie

$54.99

(46 reviews)

My Little Pony™ - Firefly Onesie Kids Onesie

$49.99

(20 reviews)

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

My Little Pony™ - Bluebelle Onesie Kids Onesie

$49.99

(20 reviews)

Child wearing a Superman-themed onesie with a red cape on a white background

Merry Jinglejoy - Tree Adult Onesie

$44.99

(46 reviews)

Sonic the Hedgehog™ Adult Onesie

$54.99

(46 reviews)

Two people wearing red Knuckles-themed onesies on a white background

Merry Jinglejoy - Santa Adult Onesie

$44.99

(13 reviews)

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.