According to Scott:
Originally presented in Amazing Spider-Man #317, by David Michelinie and Todd McFarlane. Spiderman, for some reason takes of his costuume, wearing ntohing but tight red briefs, he battles venom, who's suit tries to attack patar, leaving them both in their undies.
I haven't found any of the actual texts, but this page:
Has all of the pages, but sort of completely messed up the words.