Ok I'm my humble opinion you need to sort the bottoms first.
1 x pair well fitting jeans
1 x pair of trouser go for the opposite so skinny jeans wider leg trouser
1 x fitted skirt (pencil with some stretch is always a good staple)
1 x fit and flare skirt
2 x dresses again i tend to do one closer fit and one more fit and flare style)
Tops tend to be easier you want an assortment of 5. I tend to do
1 x wrap style
1 x long sleeved fitted shirt
1 x tunic style
1 x sleevless style
1 x other
Jumpers / cardigans
1 x long line cardigan
1 x fitted short cardigan
1 x long jumper / jumper dress
1 x fitted jumper
Coats
1 x biker
1 x longer line coat
1 x blazer or jacket (probably option but personally it makes everything much smarter)
These are the staples to any wardrobe and if your going capsule then quality and fit is definately the way to go. Stick to a colour pallet so you can mix and match everything together
Shoes (now I admit I have a shoe addiction) but your need at least these
1 x knee length boots
1 x ankle boots
2 x heels (they go with everything)
Accesories (these you can change regularly so you don't need to spend as much on them) look for pops of colour and they really do make your wardrobe look very trendy.
Gloves
Bags
Belts
Scarves
Tights
Vest tops
Summer
2 x dresses
1 x light weight trouser
1 x light weight skirt
1 x smart shorts
1 x casual shorts