'Singlet' definitions:

Definition of 'singlet'

From: WordNet
noun
A collarless men's undergarment for the upper part of the body [syn: singlet, vest, undershirt]

Definition of 'Singlet'

From: GCIDE
  • Singlet \Sin"glet\, n. An unlined or undyed waistcoat; a single garment; -- opposed to doublet. [Prov. Eng.] [1913 Webster]