is this for work, SAHM and/or going out?
off the top of my head my usual recommendations are:
two trous (not jeans)
one fitted jacket (single breasted)
one pair boots
one scarf
five tops in asstd sleeve lengths
bag to match boots
two big necklaces, one to match each trousers
plus (optional)
winter coat
skirt(s)
wrap dress
Not entirely sure what you mean by 'winter colours' though - is this a Colour Me Beautiful type Winter (ie cool and bright blues and pinks, black, white, grey, and icy pastels)?
If so then try charcoal, slate or black for the trous, boots and jkt, with tops in pale blue, bright blue, hot pink, bluey purple.
Navy sounds like it would suit you but I find it really hard to put with other colours - navy and grey looks v sophisticated though, so a navy top could work with jacket and trousers in of grey.
Agree wide-leg trousers and fitted tops are a good plan - try on v-neck, scoop and wrap styles to see which suits you best. Ones that cling round the ribcage but not round the actual bust can be very flattering.
If you are lacking in the waist dept see if you can get a jacket waisted to within an inch of its life but be aware of where it finishes on the bum - a couple of inches in length makes for a very different look.
this might be a good one to try.
I know it only seems like a few clothes but if you shop carefully so everything goes with everything else (ie get a jacket that goes with both trousers, and tops that go with all three) you get a lot of outfit combos, esp if you add in a skirt.