onesie

noun

one·​sie ˈwən-zē 

plural onesies

1

: a bodysuit for an infant having a snap closure at the crotch and not covering the legs

… her husband, Prince William, gratefully accepted a onesie labeled "Daddy's Little Co-Pilot" from a well-wisher …

—Michelle Tauber et al.

2

: a one-piece garment for adults usually with long sleeves and pants and sometimes with a hood

All eyes were on Pharrell Williams' wife, Helen Lasichanh, during the Met Gala on May 1, but it was for all the wrong reasons. We were hoping Helen would show off her amazing post-baby body after birthing triplets, but instead, she covered her body in a giant red onesie that some Twitter users were comparing to the red Teletubbie!

—Christopher Rogers

Example Sentences

Recent Examples on the Web

The ongoing semifinals have offered a little taste of what to expect, including some eye-popping costumes, ranging from military drag to intergalactic warlords to glittery man-style onesies. —Karla Adam, Washington Post, 10 May 2023

Moms and onesie connoisseurs alike rejoiced at the arrival Bumpsuit, the maternity-and-beyond clothing label founded by Australian model Nicole Trunfio. —Danielle Directo-meston, The Hollywood Reporter, 10 May 2023

For the big moment, the little one was dressed in a tan two-piece tweed outfit with a white onesie underneath, and a white bow on her head. —Alexandra Schonfeld, Peoplemag, 9 May 2023

Mandy, who is Black, said one woman wore a Confederate flag sweatsuit, some of the diners wore black jackets with Confederate flag patches and a child who was with the group even had on a Confederate flag onesie. —Quinlan Bentley, The Enquirer, 6 May 2023

Kendall in a custom Marc Jacobs sequined black cheeky onesie with a silver glitter collar and train-length sleeves; Kylie in a red Jean Paul Gaultier gown with a playful one-shoulder cutout and thigh-high slit. —USA TODAY, 2 May 2023

The baby wears a black onesie with a white cartoon ghost print. —Rosa Sanchez, Harper's BAZAAR, 14 Mar. 2023

Items needed include sizes 3 months - 2T diapers, wipes, baby lotions, shampoo, diaper rash creams, blankets, onesies, crib sheets, towels and pajamas along with car seats, playpens, cribs, and high chairs. —Linda Mcintosh, San Diego Union-Tribune, 10 Mar. 2023

An area hospital dressed all newborns in Pirates onesies. —Gabe Lacques, USA TODAY, 1 May 2023

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Word History

Etymology

one entry 1 + -sie (after the trademark Onesies)

First Known Use

1983, in the meaning defined at sense 1