I'm another Gen X'er, graduated from high school in 1990. I think my worldview, distrust of corporations and advertising, mass media literacy, semiotics classes and all that jazz was very formed by the 90's. That's why I agree with La Pedestrienne in the other thread who said the 90's were about the conscious rejection of the idea of 'fashion':
Anti-fashion as a liberatory statement. With the kids, it all seemed to be about looking as thrown-together as possible. The grunge element, sure, but really just a sense of trying to look like you didn't give a damn -- about how you looked, about how you were seen.
So the 90's were kind of my default approach to dress as not-dressing, I was a skateboarder who made her own tie-dye shirts and wore cut off army surplus fatigues with high top converse (we were super proud when we wore a hole in the spot where the shoe hit the board when you ollie). Later on I lived in black leggings and engineer boots (couldn't afford Docs), and thrifted flannel with army surplus coats. My main fashion memory is perms. I went full on Julia Roberts in Mystic Pizza/Pretty Woman with the wild long mop - and that was kind of a late 80's hold over. Style icon I remember being idolized? Kim Gordon.
Also I live in the town where the dream of the 90's is still alive, or at least until it became the 1890s with the emergence of the beard and backyard farming, lol. Anyways I loved 90's music, I loved 90's rejection of all that happy shiny 80's stuff, but it took a long time for me to stop defaulting to elements of 90's dress (well into the 2000's cough), so that's why I'm not so eager to revisit just yet (I just left it behind ).
ETA: also nodding along with Aziraphale that for me dressing up is a choice, something I do primarily for fun and creative exploration and to pay respect at certain important events, I'd certainly balk at it being a requirement.