From pre-Covid times freelancing in London creative agencies, you can break it down into lots of different subtypes.
Lots of mid-20s people in ad agencies had very similar looks IMO: women had bobs or long hair, culottes or straight jeans, chunky trainers, hoop earrings, big coat, men wore jeans and sweatshirts or cropped trousers, fisherman beanies and short back and sides. Scandi-style or sportswear influences.
OP in your post you mentioned Sweaty Betty leggings, big coat and Nikes so you might like the brand Weekday or take a look at Emma Hill on Insta. Bit pricier but Acne might also suit.
Fashion agencies - way more eclectic - mullets galore, dyed hair, lots of piercings, charity shop or home-made clothes mixed with designer stuff. I worked with (IMO) a very cool woman who was half-Ghanian and half-Swedish and she had a whole 1960s flared trousers and wax-printed shirt thing going on with a heavy fringe and neon eyeliner.
Agree with Flo it's a reasonable question and it's reminded me how much I miss outfit spotting...
Hope some of this is helpful!