Is there a website that has all the guide images explaining the origins of alternate clothing options?
The last bulletin point of each characters costumes gives a short little description of it’s origin.
I actually mean the rest of these images: http://fans.marvel.com/marvel_interactive/blog/cat/general?page=2&per_page=5 It looks like they only list the special clothing for the Capcom characters and all of the clothing for the Marvel characters.
Key words to find the guide images on this site are: UMvC3, alternate color, and costume.