I would say:
Plain deep coloured v neck or scoop neck jumpers in cotton, cashmere or silk, or a mixture of the above - especially in grey or black.
Fitted cardigans with a v neck and tiny buttons in good fabric and classic colours.
Straight, above the knee denim skirt. Ditto a black skirt in a similar shape (if I could actually find one).
Silk camisoles and those jersey camisoles with a bit of lace at the neck.
Belted, just above the knee mac with no fussy details.
Wide legged trousers in black, grey, tweedy stuff etc.
Long sleeved scoop neck good quality t-shirts.
Knee high, narrow legged, flat or slightly heeled boots in black and brown.
Dark, straight legged jeans (ditto:if I could find any).