"The Sinister Secret of Spider-Man's New Costume!"
November 1984
Reed Richards deduces that Spidey's costume is a living symbiote, and removes it
marvel.com
reprinted in
*
Amazing Spider-Man Complete Collection
2006, in collection
(2006*)
*
Amazing Spider-Man: Saga of the Alien Costume TPB
1992, in collection
(1992*)