I assume that white socks and undergarments came from bleaching. You can sanitize and sterilize with bleach, but it also removes color. With modern cleaning processes, detergents, and materials that is less common and so color is allowed to thrive.

That said, I’m all black everything because it makes laundry easy.

You can, however, rename them.

In some ways that’s really neat tech, in others it sounds like a setup for a plot based around forcing someone to think a secret so that it can be stolen. Maybe it’s a heist, maybe it’s a government interrogation.