undershirt

from WordNet (r) 3.0 (2006)
undershirt
    n 1: a collarless men's undergarment for the upper part of the
         body [syn: {singlet}, {vest}, {undershirt}]
from The Collaborative International Dictionary of English v.0.48
Undershirt \Un"der*shirt`\, n.
   A shirt worn next the skin, under another shirt; -- called
   also {undervest}.
   [1913 Webster]
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