UNDERSHIRT

singlet, vest, undershirt

(noun) a collarless men’s undergarment for the upper part of the body

Source: WordNet® 3.1

Etymology

Noun

undershirt (plural undershirts)

(fashion) An undergarment worn beneath a shirt, often collarless and sleeveless.

Usage notes

As a rather generic term, undershirt is more often used in reference to male clothing, while female equivalents employ more specialized terminology.

Synonyms

• singlet, wife-beater (men); vest (UK); see also underbodice (female equivalents)

Source: Wiktionary

Un"der*shirt`, n.

Definition: A shirt worn next the skin, under another shirt; -- called also undervest.

Source: Webster’s Unabridged Dictionary 1913 Edition