“The reason women don’t play football is because 11 of them would never wear the same outfit”

American actress and comedienne Phyllis Diller explained—as cited in print since at least 1995—why women don’t play football:
 
“The reason women don’t play football is because 11 of them would never wear the same outfit in public.”
 
The joke was popular before the rise of women’s team sports, such as soccer.
 
   
Wikipedia: Phyllis Diller
Phyllis Ada Driver (July 17, 1917 – August 20, 2012), better known as Phyllis Diller. was an American actress and stand-up comedienne, best known for her eccentric stage persona, her self-deprecating humor, her wild hair and clothes, and her exaggerated, cackling laugh.
 
Los Angeles (CA) Times
MORNING BRIEFING
April 06, 1995|MAL FLORENCE
(...)
Quotebook: Comedian Phyllis Diller: “The reason women don’t play football is because 11 of them would never wear the same outfit in public.”
   
Google Books
The Mammoth Book of Comic Quotes
By Geoff Tibballs
London, UK: Constable & Robinson Ltd
2004
Pg. ?:
The reason women don’t play football is because eleven of them would never wear the same outfit in public.
PHYLLIS DILLER
 
Google Books
1001 Funniest Things Ever Said
Edited by Steven Price
Guilford, CT: Globe Pequot Press
2010
Pg. 116:
The reason women don’t play football is because eleven of them would never wear the same outfit in public. —Phyllis Diller
   
Google Books
Wise Women:
Wit and Wisdom from Some of the World’s Most Extraordinary Women
By Carole McKenzie
Edinburgh, Scotland: Mainstream Publishing Company
2013
Pg. ?:
The reason women don’t play football is because 11 of them would never wear the same outfit in public.
Phyllis Diller (1917-2012), American actress and comedienne
   
Google Books
25,000 Miles to Glory:
Football, Freedom, Friendship, And America
By Rhett Grametbauer
Bookbaby
2016
Pg. ?:
The reason women don’t play football is because 11 of them would never wear the same outfit in public. – Phyllis Diller