I'll admit that it looks a bit like your grandparents' bath towels, but this is actually the largest piece of clothing ever made purely from spider silk.
Sadly, it's not bulletproof or anything like that -- it's just very, very yellow. In fact, it gets its hue from the undyed filaments of the golden orb spider, a species of arachnid commonly found in Madagascar. It was also a pain in the arse to make.
This feat of engineering and fashion is on public display at the Victoria & Albert Museum in London, UK. You probably won't ever be able to get on yourself, but then, I don't think yellow's really your colour, dude. [ecouterre via Slashdot]
Image: Victoria & Albert Museum