the.com/onesie

The socially acceptable way to become a toddler again with zip-up dignity.

means A one-piece garment, especially a loose all-in-one outfit for lounging or sleeping, modeled on an infant's bodysuit but sized for adults and older children.

from From 'one' plus the diminutive-playful suffix '-sie' (as in 'oopsie' or 'footsie'), originally trademarked baby talk for a one-piece infant bodysuit in the mid-20th century. The adult lounging version — and the word's leap into general use — is a much more recent development, riding a wave of comfort-clothing popularity in the early 2010s.

trademark fight
The word is a registered trademark in some countries
bathroom problem
Full-body design makes bathroom trips a strategic operation
baby origins
Adult versions borrowed the name from infant bodysuits
festival staple
Animal onesies dominate music festivals and lazy Sundays
for instance

footie pajamas — traditional one-piece sleepwear with feet, popular since the 1950s

kigurumi — japanese animal onesie costume trend that exploded in popularity from 2010 onward

zippy — australian brand of one-piece infant sleepsuit, trademarked and widely used since 1980s

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