From: SHRINE of Hollywood.

An elegant double breasted vest for formal occasions. A fitted vest made in rich black tapestry fabric with a stand up to collar and wide sweeping lapels. Fastens on the inside with a sturdy button and buttons on the outside with five engraved metal buttons. The vest back and inside lining is made from rich black satin.
 
Measurements when laying flat.
Size S - armpit to armpit 19"
Size M - armpit to armpit 20"
Size L - armpit to armpit 21"
Size XL - armpit to armpit 22"
Size XXL - armpit to armpit 23"