I work in finance in London and now instead of suits almost all of my mostly male colleagues wear chinos, a shirt with the top button undone on a polo shirt with a jumper over the top (almost always blue.
I have to admit to hating smart casual as it feels so stressful. With suits it was easy and I didn't have to think. Now I spend ages trying to decide what to wear. Is there an equivalent outfit to the chinos one?