"Soft Natural" is essentially Natural with Romantic. Romantic is sexy, womanly femininity. Now, that kind of feminine beauty isn't the only kind. But some systems believe it is.
In a system that only has one feminine essence, all manifestations of feminine beauty end up getting assigned to Romantic. So women whose feminine beauty is of the Ingenue or Ethereal variety end up getting categorized as Soft Natural, and the recs don't all work.
For example, Soft Naturals supposedly get light, floaty fabrics. Those don't work well on women with a lot of Romantic, but they're great on women with a lot of Ethereal. If you're an unsatisfied Soft Natural who looks great in light-as-air fabrics and the most mystical aspect of Soft Natural, you might be Ethereal Natural instead.
Soft Naturals also supposedly get puff sleeves. Puff sleeves are girly, even princessy -- in other words, they're Ingenue. If you're an unsatisfied Soft Natural who's great in puff sleeves and other girly aspects of Soft Natural, you might actually be a Natural Ingenue.
Still lost? Consider a virtual analysis.