I'm guessing this must be an evolution of Cure White, and how she'd look today if she aged accordingly (she'd be roughly around 23 years old in 2012). The Cure outfit is very "mature" looking. If this wasn't the intent, then it sure looks that way.

That's Cure White from the precure all-star fanfic Dissonance. Not sure why the colored versions of Aqua and Mint aren't on here, too.
Added missing Dissonance tag that is present on the other image from the same source, Adult Cure Lemonade.