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The Tuxedo (1987)
Though he did manage to fight a few bad guys in the issue, the crux of the story dealt with the marriage of Peter Parker and Mary Jane Watson. Peter took off the mask for a little bit to put on this tuxedo. This is the only suit on the list to be wiped from continuity as well. In the 'One More Day' storyline, Peter sacrifices his marriage with MJ to save his Aunt May.
Cosmic Spider-Man (1989)
Much like his green ally the Hulk, Peter once had a lab accident himself. When (once again) something went horribly wrong, Spider-Man was given even more enhanced powers along with the ability to shoot off energy blasts and to morph his webs into any shape he pleased. It didn't last long, unfortunately.
Spider-Man 2099 (1992)
Taking place long after the current Marvel heroes have been gone, there was a scientist named Miguel O'Hara. Miguel worked in a laboratory where they were trying to create super soldiers with powers and he was particularly inspired by records of Spider-Man. Through some black mail and trickery, O'Hara accidentally has half of his genes replaced with that of a spider. He then decided to take up the mantel.
This suit was created specifically to fight off a group known as the 'New Enforcers.' Though it doesn't appear very much in the comics, it is a fan favorite and appears in many of the video games.
The Scarlet Spider (1994)
Peter didn't actually use this costume at first. He did eventually wear it, but his clone Ben Reilly took up the name and this suit in New York for some time. Many others have taken on this name and costume as well.
There was also a time when Peter wanted to retire from being the wall crawler so he could raise his daughter. During that period, he asked Ben Reilly to replace him as Spider-Man. Reilly put on a different style costume in favor of wearing Peter's original design.
Go to Page 3 for the Identity Crisis!