onesie

Etymology

From the Gerber Childrenswear brand name Onesies. The name became generic and was reinterpreted as a plural, hence the new singular and decapitalized "onesie". Equivalent to one + -sie.

noun

  1. Name given to a number of one-piece attires
    1. (US) A one-piece garment for an infant or small child, generally worn over a diaper.
    2. One-piece adult loungewear jumpsuit.
    3. One-piece fashionable streetwear worn mostly by teenagers.

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