Waistcoat attributed to LtCol Andrew Stephens, second-in-command to Col Washington,
1st Virginia Regiment (c. 1750-60) 
Washington in the uniform of a British Provincial Colonel,
by Peale (1772), Washington and Lee Univ.
The Stephens waistcoat is almost identical.
Note the raw edge of the fabric on the arm hole detail.
 Smithsonian online collection, The Price of Freedom: Americans at War, http://amhistory.si.edu/militaryhistory/exhibition/flash.html?path=1.5.r_446, accessed 26 Jan 12.