“Plain and Simple,” her best-selling 1989 book, was a go-to text of the anti-materialist movement known as voluntary simplicity.

Clinique's legacy in the beauty world is hard to overstate. Founded in 1968, the brand has been committed to dermatologist-developed skin care and makeup from the very beginning, long before that became a selling point. It also helped shape the skincare routines many of us still follow today, thanks to its iconic three-step system, which remains a bestseller decades later. What really sets Cliniq…