'It's very easy to talk,'said Mrs Mantalini.'Not so easy when one is eating a demnition egg,'replied Mr Mantalini; 'for the yolk runs down the waistcoat, and yolk of egg does not match any waistcoat but a yellow waistcoat, demmit.'

-Dickens, CharlesJohn Huffam
^9  Nicholas Nickleby, ch.17.

Never lay yourselfopentowhat iscalled conviction: you might as well open your waist-coat to receive a knock- down blow.

-Hunt, (James Henry) Leigh
  'Rules for the Conduct of Newspaper Editors', in The Examiner, 6 Mar.

What they call 'heart' lies much lower than the fourth waistcoat button.

-Lichtenberg, Georg Christoph
c.1776^1779  Aphorisms, Notebook F (translated by R  J Hollingdale,1990).