I have several “uniforms” depending on the time of year, which maybe isn’t helpful.
Summer:
Midi-skirt, tucked in t-shirt
Midi-dress
Culottes/wide-leg trousers, tucked in t-shirt
Winter:
A-line short-ish skirt, opaque tights, fitted jumper - crew or polo neck
Culottes/wide-leg trousers, slightly cropped jumper, sitting on waistband - crew or polo neck
Skinny jeans, blouse, crew-neck jumper over the top
Summer and winter I also wear “barrel leg” jeans, with either tucked in tee, fitted jumper, or slightly cropped jumper.
Footwear is trainers (black or white Stan Smiths, black or grey Continental 80s, various Nikes), brogues, Chelsea boots, or DM boots. I have Saltwater sandals and flip-flops for hot days, but don’t really like wearing those.
All of the above work for work, and not-work, there are just variations. I tend to keep work/not-work clothes fairly separate, but am able to be fairly smart/casual at work.
I think the key is knowing what suits your shape.i have a small waist/flat tummy, but big hips/bum. I need clothes that define my waist, so these “uniforms” work for me. My friend is a more “apple” shape, and her “uniforms” are completely different - slim trousers or jeans, and more floaty top, or shift/tunic style dresses. She hates anything that highlights her waist or stomach, but has super-slim bum and hips - her floaty blouses would make me look triangle shaped.