pin·stripe also pin stripe (p?n?str?p?)n.1. A very thin stripe, especially on a fabric.2. a. A fabric with very thin stripes, often used for suits.b. often pinstripes A suit made of such fabric.pin?striped? adj.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.pinstripe (?p?n?stra?p) (in textiles) n (Textiles) a. a very narrow stripe in fabric or the fabric itself, used esp for men’s suitsb. (as modifier): a pinstripe suit. Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014pin?stripe (?p?n?stra?p) n. 1. a very thin stripe, esp. (in fabrics) a thin white stripe on a dark background. 2. a fabric or garment having such stripes. [1895?1900] pin?striped`, adj. pin?strip`ing, n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.