While clothing does block the sun's harmful rays, they don't always do so completely. This is especially true of thinner material, or material that is lighter color. If you walk around in a white t-shirt, with no undershirt, and the sun is blazing enough, you will get a slight tan. If you wear an undershirt, even if it is a thin white one, this effect will be reduced.
Edited 1 time(s). Last edit at 01/15/2014 08:04AM by forbiddencokedrinker.
I'm a naturally tan blonde so I don't have to go to the tanning salon. A hundred or so years ago no lady would be caught dead with tanned skin. Having a pale-as-death alabaster complexion was regarded as the epitome of femininity. Darker skinned women are now making themselves lighter and fair skinned women are making themselves darker. Eventually everyone will be the same dark tan colour.
The "Book Of Mormon" authors never imagined a future where being tanned is a sign of health, wealth, and status -- and not evil.