The myth of "effortless"
The Parisian look is sold as effortless, which is the most misleading word in fashion. It is in fact a tightly controlled silhouette and a near-monochrome palette, styled to *look* thrown-on. The "effort" is invisible because it's front-loaded: the right blazer, the right denim, the right flat, bought once and worn for years.
What reads as nonchalance is really editing. A French wardrobe is small. The same trench, the same Breton, the same black trouser recur endlessly. The variety comes from how they're combined, not from how many pieces there are.