This is a random superhero suit I designed that is green and has a triangle shape on the chest, and a weird symbol on the back...
To install:
Add the "superhero" archive file included into the "skins" folder in your GTA Vice City. This folder should be in your program files under Rockstar Games. When you have the "superhero" file(included) into the "skins" folder, right click on it and click "extract here" then boot up GTA Vice City and you're ready to go!
WARNING: When you go into the skins menu (pressing pause, going to "options", then "player skin setup") and select this costume, it may or may not load quickly and your game may freeze, if it does this just wait it out. Then you can play the game normally with the costume. If the freezing does occur, it may also help to bring up "Windows Task Manager" but don't do anything. When "Windows Task Manager" comes up, just click the "X" to close it.