"Your neck is hidden by the sun, so it's always going to be much lighter in comparison," said Caroline. "If you don't take the colour of your chest into consideration, your face will be disconnected from the rest of your body. You also have to match in daylight – there’s no question about it. If you’re buying from the high street and not being matched by a makeup professional , take a few spare containers so that you can pump the tester shade in. Take your tiny sample home, try it properly, look at yourself in the mirror and see if it's right for you. Also, take a photograph for yourself outside or by a window to see how it looks, but don’t use flash."