One pair of plain back leather ballerina flats.
These go with just about anything, be it skinny jeans or a knee length skirt. Timeless. Also incredibly comfortable.
One pair of high heeled knee length leather boots. To wear over tights or skinny jeans, with a tunic top or mini dress. Sex on heels.
One pair of gladiator sandals. For when the rest of the outfit is a little too blah.
Anything with a bow. Anything. Ballerinas, sandals, pumps, whatever. A bow, for when you need that cute, pseudo-virginal feminine touch to your outfit.
And last, but probably most important - red patent leather pumps. Because you're a woman.