I actually don't see how one set of "wardrobe staples" can fit everyone, they should be tailored to own lifestyle.
Factors to consider would be:
-climate (here its coats coats coats and thermals for under things). Also whether you personally run to cold or not? I look great in a jumper over a white shirt, but actually for winters I don't find this warm enough and need a roll neck (flattering colour and fitted and pearls/little scarf over the top).
-commute (i don't drive so lots of flat shoes and boots needed!)
-own personal style (doc martens or country lady?) I am hourglass and actually prefer dresses/skirts to jeans so really only need one pair of jeans.
-own lifestyle (Mine is work in uniform except one day when I need fairly smart casual stuff, no children, like dressing, tend to go out but more arty/cultural than clubbing, lots of city walking). I have to go through some pretty rough areas for commute, so like an element of "blend in" about my outfits then. I like hippy clothing for holidays, but not in town. I do lots of running and dance.
- work out what percentage of time you spend in various places? i worked out a couple years ago that I had far too many "going out" clothes and not enough warm comfy stuff for just lounging round the place (chilly!).
So I made a point of buying things "just for the house" (ethnic knits and Afghan slipper socks) and they've made my quality of life a whole lot better).
- Underwear - I think two really good bras save time on thinking about choosing one. I go for Agent P and they've lasted me YEARS and improve the shape of any outfit.
at the moment my wardrobe staples are lots of coats, thermals for putting under things, waterproof riding boots, fitted roll necks in flattering colours, pearls, scarves, plain black shoes for work, my sherpa knits for housewear, expensive trainers.
They get more wear than anything else. I literally wear them to breaking point.