“What kind of clothes do zombies wear?”/“Decay NY.”

A popular Halloween riddle about New York-based fashion house DKNY is:
 
Q: What kind of clothes do zombies wear?
A: Decay NY.
 
The joke has been cited in print since at least 1999.
 
   
Wikipedia: DKNY
DKNY is a New York-based fashion house specializing in fashion goods for men and women founded in 1984 by Donna Karan.
 
Google Groups: alt.callahans
spookers
LePheaux
10/30/99
(...)
What kind of clothes do Zombies wear?
Decay NY.
   
Google Groups: sci.med.dentistry
Halloween humor - like dental humor.
Rockyboy
10/30/99
(...)
What kind of clothes do Zombies wear?
Decay NY.
     
Flare Sci-Fi Forums
Topic: Halloween funnies…
Baloo
posted October 30, 1999 01:54 PM
(...)
What kind of clothes do Zombies wear?
Decay NY.
(I don’t get that one. Will somebody help me shift my paradigm here?)
   
Twitter
Dane Dewbre
‏@MarlandDane
What kind of clothes do zombies wear?  Decay NY!
3:54 PM - 30 Oct 2009
 
Twitter
Honor
‏@HonorRebleRon
What kind of clothes zombies wear? Decay ny lol
3:30 PM - 27 Mar 2016
 
Twitter
Punstrated
‏@IncitingMoment
What kind of clothes do well dressed zombies wear?
DECAY N Y
8:13 PM - 27 Oct 2016
 
Twitter
LAFC
‏@LanarkshireAFC
@ascensos What kind of clothes do the coolest zombies wear? Decay NY!
7:49 AM - 28 Oct 2016
 
Twitter
Punstrated
‏@IncitingMoment
What kind of clothes do stylish zombies wear?
DECAY N Y #HappyPunoween
4:32 PM - 29 Oct 2016