I like to do this:
Primary colors or Princessy Colors = Magic Kingdom
Safari Animal Prints-Browns & Earthy = Animal Kingdom
Royal Blue/Gray/Show biz = Hollywood Studios
Black or "Grown up" Futuristic = Epcot
Orange and California Colors= California Adventure
Princessy Colors=Disneyland
One thing I am doing lately is trying to wear plain (no prints) I think it turns out better for scrapping and makes the Characters stand out more or if I add elements into my page it looks nicer. that is just me!
Hope that helps, check CynthiaY gallery, she does an awesome job with the parks and Outfits!
http://www.mousescrappers.com/photos...name=cynthiay2