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A waist-length fitted jacket, worn chiefly as part of a uniform on formal occasions. Also called monkey jacket, shell jacket.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Clothing & Fashion) a waist-length jacket tapering to a point at the back, worn by officers in the mess for formal dinners
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a close-fitting, waist-length jacket worn by men esp. as part of a uniform.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.