Grunge was influenced by punk's anti-fashion ideals.
Grunge developed in the early ’90s and heavily borrowed from punk culture's stance on image, "prettiness," and style. Just as punk DIY and shock fashion was a direct response to hippies, grunge's utilitarianism and uncleanliness ran counter to the otherwise flashy aesthetic of the ’80s. Kurt Cobain wearing a T-shirt with a handwritten "Corporate magazines still suck" on the cover of Rolling Stone was a move that seemed straight out of punk's early days, when musicians scrawled political commentary on their clothes.
Similarly, by being so anti-fashion, both punk and grunge ultimately and ironically trickled up to influence high-end fashion. Elements from both subcultures can still be seen on catwalks around the world.