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Related to watch cap: stocking cap
1. A dark blue knitted cap worn in cold weather by enlisted naval personnel.
2. A similar close-fitting knitted cap.
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.
(Nautical Terms) a knitted navy-blue woollen cap worn by seamen in cold weather
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a usu. dark blue, knitted woolen cap with a turned-up cuff worn esp. by naval enlisted personnel.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.