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Related to Eton jacket: mess jacket
A waist-length, traditionally black jacket that has wide lapels and is cut square at the hips.
[After Eton College, England.]
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 with a V-shaped back, open in front, formerly worn by pupils of Eton College
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a boy's black waist-length jacket with wide lapels and an open front, orig. worn by students at Eton College.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.