it probably has a lot to do with the invention of mass media. Before radio and television, I think “trends” moved much more slowly, simply because in order for a style of dress or music to move from one place to another, actual people had to take it with them, and then it had to spend some time catching hold.
I think that probably everyone for all time has considered their parents’ generation and all its trappings to be embarrassingly old. This has probably been exacerbated now by the fact that modern medicine lets us live long enough to see several generations come to fruition.
In terms of fashion…I would posit that fashion, just like music, tends to be a reaction to the decade or so before it. Or at least that’s been the case from the fashion I’ve been alive to observe. Especially the fashion that is worn by musicians. Ex:
tight EVERYTHING, big hair (incl. men), bright colors, workout wear, shit tons of makeup for both men and women, high-waisted pants
long masturbatory guitar solos, synthesizers everywhere, very slick studio production, eight-minute songs that end in a fadeout
oversized everything (the hip-hop/CrossColours trend), grubby jeans/t-shirts/flannels, low-rise jeans and crop tops, the “kinderwhore” look
stripped-down three-piece bands, DIY recording aesthetic, dropped-D tuning, two-minute tunes with lyrics that are often totally obscure
I hate fashion. Hate it with the burning fire of a thousand suns. This is why most of my clothes are modeled on a “retro” (generally 1950s) aesthetic. It suits my body type, it’s currently considered cute and kitschy, and it ain’t gonna be changing anytime soon. 2 months ago