Origin of tux
First recorded in 1920–25; by shortening
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tux
Charming Prince Harry slipped into his tux for a dinner tonight in support of Walking With The Wounded's race to the South Pole.Sexy Harry Slips Into Tux For London Fundraiser
May 30, 2013
A retired construction worker, Dorwan spent his spare time fixing up the church along with his dog, Tux.Obama's Arizona Speech: Video and Text
The Daily Beast
January 13, 2011
He was at the Golden Globes, he was wearing a tux, and he looked like a dream I once had about the perfect man.10 Hot Valentines
February 14, 2009
Say, I'll bet he don't know there is such a thing as a Tux—as a dinner-jacket.
Well, let me tell you that your revered paternal ancestor, Henry T., doesn't even call it a 'Tux.'
In the Tux district trips were taken from Lauersbach, and the more difficult the climb the more it pleased Oswald.An Aviator's Field Book
Word Origin and History for tux
1922, colloquial shortening of tuxedo.
Online Etymology Dictionary, © 2010 Douglas Harper