Now, you may still wonder whether you should wear an undershirt at all. Simply a matter of personal preference, there is no right or wrong here.
SOME OF THE ADVANTAGES OF WEARING A VEST FOR MEN:
If you sweat profusely, wearing an undershirt will help absorb the sweat.
Evening shirts with a stiff front for black tie and white, undershirts can help avoid chafed skin, and it is invisible underneath the bib shirt front.