A garment formerly worn by men under a doublet.(noun)
Chiefly British A short, sleeveless, collarless garment worn especially over a shirt and often under a suit jacket; a vest.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "waistcoat" in a sentence
"The waistcoat is important, see, because the colors denote certain ranks."
"He had a tuft of white hair at the back of his dark head, like the cotton-tail of a rabbit, and as well as corduroy breeches he wore a rabbit-skin waistcoat, and he was a great nuisance to gamekeepers, who called him a poacher; whereas all he did was to let the rabbits out of the snares when it was kind to, and destroy the snares."
"And this was the first and last time we ever saw Jack London arrayed in waistcoat and starched collar."