I work out of a fairly casual office. I'm also out and about a lot, sometimes traipsing through parkland and woods or in and out of old buildings. So work clothes are quite tricky to get right. I don't wear jeans to work ever and I'm a bit smarter than most of my colleagues - I like a separation between work and home clothes, helps me to switch off/on.
In spring summer I wear:
Ankle grazers or cigarette trousers (navy/black/some bright colours)
Silky t shirts or scoop neck t shirts tucked in (navy, black, grey, white, cream)
Ballet/slipper flats - tan, leopard print, favourites are orange ATM
Slightly cropped blazer/jacket (navy, yellow, black, coral, khaki)
In autumn/winter:
Dresses, opaques, ankle boots/knee high boots, sometimes with jacket. Dresses usually shift/cocoon and plain dark colours or striped
Narrow cut wool trousers, fine knit sweater or silky top and knitted jacket
Mini ish skirt, opaques and boots, wool sweater
I've also got 2 wool coats, a winter and summer waterproof coat, and a cropped wool jacket.