I 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. What it is is 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 ass to make, needing over 1 million spiders to complete it.
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 color, dude. [ecouterre via Slashdot; Image: Victoria & Albert Museum]