This is probably quite simple to do. I'm guessing that the charachter is split into 3 sections (top, middle, and bottom). The animation for each section would hold the number of changes you wanted to make as separate frames (red top, green top, blue top... you get the idea). When the user clicks on a button it changes the frame for that section, and that's it!
To save your character, you could just use variables to remember which frames you chose for which sections.
It may be worth taking a look through the 'How do I' section, as it has lots of good examples and should help to familiarise you with the C2 basics
'How do I'
Hope that helps :)