I think I got sunburned through jeans today. I just drove back from being out of town. The trip was about 3.5 hours and the sun was to my right the whole time. It was in the 80s today, and my A/C is shot, so I had to drive with the windows down. My right arm got really burned, and I think my leg did too. I just took a shower, and the portion of my leg that would have been in the sun is all red and blotchy like it got burned as well. Sigh. My leg felt overly warm during the drive, but I just assumed it was dark fabric interacting with the light.