“How do you know when your girlfriend is getting too fat?”/“She fits in your wife’s clothes.”

A popular fat joke—from a man’s perspective— is:
 
Q: How do you know when your girlfriend is getting too fat?
A: She fits in your wife’s clothes.
 
The joke has been cited in print since at least 2008. The author is unknown.
 
   
GSX-R Motorcycle Forums
Re: My Very Favorite List of Jokes! Rated NC-17
Kyle S
03-11-2008, 10:59 PM
Damn that was long, a few good ones in there.
 
Heres one someone told me the other day…..
 
How do you know your girlfriend is getting fat??
She fits in your wife’s clothes
 
Twitter
Nailed The Landing
‏@sdmike
How do you know when your girlfriend is getting too fat? She fits in your wife’s clothes (thanks steve!)
8:13 PM - 23 Aug 2008
 
Twitter
beautiful baby maker
‏@babymaker81
So how do know when your girlfriend is getting fat? ~ when she fits in your wife’s clothes!
9:43 PM - 13 Feb 2009
 
Twitter
Jeff Brown
‏@BawldGuy
From separated buddy: How do ya know when yer girlfriend’s gettin’ fat? Your wife’s clothes start fittin’ her.  botta boom
1:21 PM - 21 Mar 2009
 
Google Books
The Mammoth Book of Jokes 2
By Geoff Tibballs
London: Constable & Robinson Ltd
2012
Pg. ?:
How can you tell when your girlfriend is getting fat? – When she can fit into your wife’s clothes.
 
Google Books
Another Bob and Brenda’s Joke Book
By Paul Gwilliam
Lulu Publishing (Lulu.com)
2013
Pg. ?:
How can you tell when your girlfriend is getting fat?
When she can fit into your wife’s clothes!
 
Reddit—Jokes
How do you know your girlfriend is getting fat?
submitted February 10, 2014 by richard_rahl
She starts to fit into your wife’s clothes.
   
Reddit—Jokes
How do you know when your girlfriend is getting too fat?
submitted July 23, 2015 by Drumlin
She fits in to your wife’s clothes.
 
Reddit—Jokes
How do you know when your girlfriend is getting too fat?
submitted September 8, 2016 by [deleted]
When your wife’s clothes fit her.
 
Reddit—Jokes
How do you know you’re girlfriend is getting too fat?
submitted January 18, 2017 by porschephiliac
She can fit into your wife’s clothes.