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Onesie vs Undershirt - What's the difference?

onesie | undershirt |

As nouns the difference between onesie and undershirt

is that onesie is a one-piece garment for an infant or small child, generally worn over a diaper while undershirt is an upper undergarment with no collar, and with short or no sleeves, worn next to the skin under a shirt; a singlet or (British) a vest.

onesie

English

Noun

(en noun)
  • (US) A one-piece garment for an infant or small child, generally worn over a diaper.
  • One-piece adult loungewear jumpsuit.
  • One-piece fashionable streetwear worn mostly by teenagers.

    • Synonyms

    * (a one-piece baby garment) romper, romper suit

    undershirt

    English

    Noun

    (en noun)
  • an upper undergarment with no collar, and with short or no sleeves, worn next to the skin under a shirt; a singlet or (British ) a vest