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[CrewDad]

preppy was originally a feminist statement.

Not exactly
Originally, preppy referred to the college preparatory, aka prep schools, in the Northeast. It also referred to the students and alums of prep schools who exhibited certain characteristics of their elite upbringing.

I assume you’re referring to this article?
http://www.thedailybeast.com/articles/2014/04/07/the-seven-sisters-all-american-preppy-style.html

The Seven Sisters ladies drew inspiration from Ivy League schools, adopting menswear-inspired blazers and sports coats, flannel pants, and varsity sweaters; they integrated bloomers—and later, Bermuda shorts—into their sports wardrobes; and suits became acceptable for women, signifying their ambition, independence, and intellect.