Some of the polishes that I've collected over time include the MUA Shade 18, Ciate Amazing Gracie, Ciate Ivory Queen, OPI Altar Ego and my all time favourite nude (and more opaque) Essie Fiji. These are all shades than can be built up to increase opacity, but with one light coat of polish you can achieve the barely-there effect which works for classier occasions.
It's important to start off with a neat manicure. It doesn't matter how long or short your nails are, any length will work with this look. But you want your nails to be neatly shaped and even. Mine are quite long at the moment, long enough to show their own natural white tips. With a coat of pale pink polish they look quite french manicure-ish but less cheap and false - more natural. The polish I've used here is one light coat of 'Amazing Gracie' by Ciate. It's glossy enough to use alone but you could always finish your manicure with a high shine top coat.