That phrase can be a bit of a "style chameleon." Depending on who you ask, it usually points toward one of two very different vibes.
Before I pull together a full blog post and gallery for you, which direction fits what you have in mind? The Two Style Interpretations mature naive nude women
This version of "naive" refers to an uncomplicated, natural look. It features clean lines, neutral palettes, and a "less is more" philosophy that highlights natural beauty without over-styling. That phrase can be a bit of a "style chameleon