Knee high horseback-riding-style boots, unless you actually own horses.
(Tbh, I miss them, but my legs admittedly look a lot less stumpy (am 5'9" but a 16-18) with the right ankle boots.)
Stiletto heels on boots and sandals. I'm sure they'll be back, but for now, the chunky heel seems to be it.
Strappy body-con dresses.
Stud earrings and big hoop earrings (so, pretty much all my collection 😝). Teen wears the chunky small-hooped earrings my middle-aged teachers used to wear in the mid-90s.
I would argue that fleece does not look as dated as it used to, and is having a revival with the younger crowd. Had a nosey on Depop not long ago for a secondhand Patagonia fleece, for practical hiking-related reasons and an attempt at sustainable fashion. All listings had high prices for secondhand, all modelled by cute young girls about 4 sizes too small for the piece advertised.
Scraping hair back into a bun or ponytail, which I am very guilty of doing.
Straightening naturally curly hair, which I also did today, but I'm too lazy and prone to scalp issues to CG Method properly.
The pointy acrylic nails already seem to have had their day.