I think it’s possible to look smart without being corporate/formal. I love clothes, makeup, and putting outfits together, and I think I always look smart, definitely “polished”, but absolutely not formal. Everything is ironed, clean, thought through, nice accessories etc.
I’ve got a few days off this week, so currently knocking about in “lounge wear”, far from smart, but for work on Monday (creative environment) I wore:
Black leather skirt, just above the knee
Slim black polo neck jumper
Black opaque tights
Black and white leather Veja trainers
Silver Alex Monroe necklace
Nails painted dark navy, red lipstick, otherwise minimal makeup
My rule for work tends to be to wear one casual item (trainers, jeans) and keep the rest of it smart.
In my work the smartest people are senior managers, or security staff, both of whom wear suits.