Stripes can be Natural. They're especially likely to be Natural if they are irregular, or various in size, or if they read as relaxed, not aggressive.
Vertical stripes, which elongate the vertical line, are usually better than horizontal stripes (which are good for Gamines.)
Checks and plaids can be Natural if they read as something you would find on a fleece -- they should look farmer-ish, not preppy. (Preppy plaids are Classic.)
Large, stylized, somewhat abstract nature motifs read as Natural, as long as they're not aggressive-looking (which would add Dramatic) or neatly repeating (which would add Classic).
Nature prints that are more photorealistic read as Gamine or Ingenue. (The youthful essences get more literal images.) Nature prints that feature flowers will automatically bring in Romantic (if they're larger and stylized) or Ingenue (if they're smaller and more realistic.)
Paisleys are often Natural, because they're stylized nature motifs that read as a little "tribal" (which is a word I don't love; what's a better word?)
A paisley that's very tiny or very detailed is less likely to read as Natural.
Prints with abstract geometrics that seem to be randomly distributed and are largeish in size can be Natural. Go for blunt-edged geometrics; sharp-edged geomtrics will read as Dramatic (if they're large) or Gamine (if they're small.)
Women who are pure Natural and Natural blends, what prints and patterns have you found work for you?
If you're not sure of your style type, try the Style Identity Calculator or consider a Virtual Analysis.