By being slim, healthy looking, having good glowing skin, having short, neat nails unpainted or in a very dark or nude colour, no talons with glitter/patterns/nail art.
A simple hairstyle, a long bob or similar. Nothing over-styled, no outlandish colours. The more natural the better, but well blow dried and smooth. Good highlights always look expensive, but then they are expensive.
Simple, understated make up and jewellery. A nude face with just mascara and a red lipstick, or full make up but in very natural, understated colours. No over the top contouring, no huge fake lashes. No sharpie brows or very obvious lip filler or cheek filler.
Simple, elegant clothes, in black, grey, white, beige, camel, navy. Linen dresses, simple wool cardigans, well cut jeans, blazers, white shirts, silky vest tops and lots of layering. Plain blocks of colour, not too much pattern. Natural fabrics wherever possible.