You’re standing in front of a mirror with swatches of fabric fanned out across your chest. You tilt your head, squint, and suddenly—there it is. One color lights up your face, while another drains it completely. It’s not magic, it’s undertone science. Depending on your features, s...

You’re standing in front of a mirror with swatches of fabric fanned out across your chest. You tilt your head, squint,...