I'm about the same height and size (and colouring, but darker hair) as you ladies above thread, and I'm still working on defining my new capsule wardrobe/palette. I've had to ditch lots of things since having a baby.
My advice is to - as a first step - figure out which store/brand of skinny jeans look great on you. For some people, it's the really expensive designer brands; for some, it's Topshop or even Primark/Penneys. My perfect skinny jeans are from River Island. No idea why, but there you go. So now I own 4 pairs of skinny jeans/jeggings from River Island - dark denim, lighter denim, black, dark red, dark green. That's it: I don't have to think about my everyday jeans anymore.
Then you need tops and decent T-shirts. Today I'm wearing a forest green T from Cos which I actually took the time to iron. It hangs nicely and the colour is good on me. Try Cos.
A high waisted stretch pencil skirt in black might be an idea if you need to be smart - you can tuck your decent T-shirt into it and look smart yet cool. You probably don't need to spend much on one of these - try ASOS maybe?
I also have three blazers. Black, from Zara, tweedy brown, from Zara, and navy linen from (again somewhat randomly) Next. If you're size 8 and small I'd say you want to wear your blazers fairly fitted around the shoulders. Sometimes this means buying a size 6 blazer, but see how you go.
Finally, maybe invest in a metallic flat. (Oh yes, I use the singular now.) Dull gold tones suit my colouring better than silvery tones. So I am now wearing my Cos T-shirt, my dark skinny jeans, and dull gold animal print peep-toe flats. It's a totally boring outfit for working from home, but I don't feel like a complete disgrace.
Apologies if all the above makes no sense...