My uniform is very similar to Amber's. It should work well for you if your legs are slim.
I have tried the Bravado nursing vests and been impressed. I wear them on their own at home but my ample bosom means I have to wear a bra when I go out. They give me a decent uplifted shape under clothes though which makes them worth the money for me. I second the H&M vest recommendation - if you can get to a store they always have them in stock, often on one of the round displays. The ones I wear have red tags with a number on. They wash well and dry quickly.
I have bought a few pairs of jeans that fit me now. These from Zara aren't to everyone's taste but the pattern makes them extra slimming on the legs and they're not tight on the tummy which makes them practical.
These jeans again from Zara, really do have super powers. The rise is a bit higher than most of their jeans which holds some muffinage in without being too tight to sit down comfortably / entertain toddler.
Zara jeans / trousers seem to have a decent resale value on eBay too.
These wine coloured treggings from Dotty P are good on slim legs and in a "fashionable" colour.
I have loved wearing leather leggings the past two winters and will again this year. The Topshop skinny pleather ones are a good place to start. I wear them in the day with a chunky knit and in the evening with a floaty shirt and blazer.
Again, not to everyone's taste but these tie dyed leggings are lovely on.
I wear these with a vest, then either a loose denim shirt (see Gap sale for a decent one), blouse like this and in colder weather a knit like this
There are some lovely scarves out there atm. The COS cashmere scarves are c£65 but excellent value for cashmere. They come in lots of colours and are super soft and big enough to use as a scarf / baby blanket etc. I have this M&S scarf thanks to DMBL40 (one colourway is in the sale) and it is massive, lovely and very useful. For this autumny weather I really like this from M&S too.